Publishers Cambridge University Press

Cover for Edward Gibbon · The History of the Decline and Fall of the Roman Empire: Edited in Seven Volumes with Introduction, Notes, Appendices, and Index - Cambridge Library Collection - Classics (Paperback Book) (2013)

The History of the Decline and F... (2013)

Cover for Charles Babbage · Reflections on the Decline of Science in England, and on Some of its Causes - Cambridge Library Collection - Mathematics (Paperback Book) (2013)

Reflections on the Decline of Sc... (2013)

Charles Babbage

Cover for Anonymous · Musei Oxoniensis litterarii conspectus - Cambridge Library Collection - Classic Journals (Paperback Book) (2013)

Musei Oxoniensis litterarii cons... (2013)

Cover for Jane Loudon · Instructions in Gardening for Ladies - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

Instructions in Gardening for La... (2013)

Cover for Esther Alice Chadwick · Mrs Gaskell: Haunts, Homes, and Stories - Cambridge Library Collection - Literary Studies (Paperback Book) (2013)

Mrs Gaskell: Haunts, Homes, and ... (2013)

Esther Alice Chadwick

Cover for Anonymous · Baroness Burdett-Coutts: A Sketch of her Public Life and Work - Cambridge Library Collection - British and Irish History, 19th Century (Paperback Book) (2013)

Baroness Burdett-Coutts: A Sketc... (2013)

Cover for Nigel J Tringham · Charters of the Vicars Choral of York Minster: City of York and its Suburbs to 1546 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Charters of the Vicars Choral of... (2013)

Nigel J Tringham

Cover for William Brown · Yorkshire Deeds: Volume 1 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 1 - Camb... (2013)

Cover for William Brown · Yorkshire Deeds: Volume 2 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 2 - Camb... (2013)

Cover for William Brown · Yorkshire Deeds: Volume 3 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 3 - Camb... (2013)

Cover for Charles Travis Clay · Yorkshire Deeds: Volume 4 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 4 - Camb... (2013)

Charles Travis Clay

Cover for Charles Travis Clay · Yorkshire Deeds: Volume 5 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 5 - Camb... (2013)

Charles Travis Clay

Cover for Charles Travis Clay · Yorkshire Deeds: Volume 6 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 6 - Camb... (2013)

Charles Travis Clay

Cover for Charles Travis Clay · Yorkshire Deeds: Volume 7 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 7 - Camb... (2013)

Charles Travis Clay

Cover for Charles Travis Clay · Yorkshire Deeds: Volume 8 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 8 - Camb... (2013)

Charles Travis Clay

Cover for M J Hebditch · Yorkshire Deeds: Volume 9 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 9 - Camb... (2013)

Cover for M J Stanley Price · Yorkshire Deeds: Volume 10 - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Yorkshire Deeds: Volume 10 - Cam... (2013)

M J Stanley Price

Cover for John William Walker · Abstracts of the Chartularies of the Priory of Monkbretton - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

Abstracts of the Chartularies of... (2013)

John William Walker

Cover for Harold Whitaker · A Descriptive List of the Printed Maps of Yorkshire and its Ridings, 1577–1900 - Cambridge Library Collection - British and Irish History, General (Paperback Book) (2013)

A Descriptive List of the Printe... (2013)

Harold Whitaker

Cover for John Stanley Purvis · The Chartulary of the Augustinian Priory of St John the Evangelist of the Park of Healaugh - Cambridge Library Collection - Medieval History (Paperback Book) (2013)

The Chartulary of the Augustinia... (2013)

John Stanley Purvis

Cover for Walter Thornbury · The Life of J. M. W. Turner: Founded on Letters and Papers Furnished by his Friends and Fellow Academicians - Cambridge Library Collection - Art and Architecture (Paperback Book) (2013)

The Life of J. M. W. Turner: Fou... (2013)

Walter Thornbury

Cover for Walter Thornbury · The Life of J. M. W. Turner: Founded on Letters and Papers Furnished by his Friends and Fellow Academicians - Cambridge Library Collection - Art and Architecture (Paperback Book) (2013)

The Life of J. M. W. Turner: Fou... (2013)

Walter Thornbury

Cover for Alfred Tennyson · In Memoriam - Cambridge Library Collection - Fiction and Poetry (Paperback Book) (2013)

In Memoriam - Cambridge Library ... (2013)

Alfred Tennyson

Cover for Schoenhals, Michael (Lunds Universitet, Sweden) · Spying for the People: Mao's Secret Agents, 1949-1967 (Hardcover Book) (2013)

Spying for the People: Mao's Sec... (2013)

Schoenhals, Michael (Lunds Unive...

Cover for Mylonas, Harris (Assistant Professor of Political Science and International Affairs, George Washington University, Washington DC) · The Politics of Nation-Building: Making Co-Nationals, Refugees, and Minorities - Problems of International Politics (Hardcover Book) (2013)

The Politics of Nation-Building:... (2013)

Mylonas, Harris (Assistant Profe...

Cover for Hildebrandt, Timothy (Dr, King's College London) · Social Organizations and the Authoritarian State in China (Hardcover Book) (2013)

Social Organizations and the Aut... (2013)

Hildebrandt, Timothy (Dr, King's...

Cover for Harchol-Balter, Mor (Carnegie Mellon University, Pennsylvania) · Performance Modeling and Design of Computer Systems: Queueing Theory in Action (Hardcover Book) [New edition] (2013)

Performance Modeling and Design ... (2013)

Harchol-Balter, Mor (Carnegie Me...

Cover for Duvanova, Dinissa (State University of New York, Buffalo) · Building Business in Post-Communist Russia, Eastern Europe, and Eurasia: Collective Goods, Selective Incentives, and Predatory States (Hardcover Book) (2013)

Building Business in Post-Commun... (2013)

Duvanova, Dinissa (State Univers...

Cover for Lal, Ruby (Emory University, Atlanta) · Coming of Age in Nineteenth-Century India: The Girl-Child and the Art of Playfulness (Hardcover Book) (2013)

Coming of Age in Nineteenth-Cent... (2013)

Lal, Ruby (Emory University, Atl...

Cover for Fewsmith, Joseph (Boston University) · The Logic and Limits of Political Reform in China (Hardcover Book) (2013)

The Logic and Limits of Politica... (2013)

Fewsmith, Joseph (Boston Univers...

Cover for Schoenhals, Michael (Lunds Universitet, Sweden) · Spying for the People: Mao's Secret Agents, 1949–1967 (Paperback Book) (2013)

Spying for the People: Mao's Sec... (2013)

Schoenhals, Michael (Lunds Unive...

Cover for Fewsmith, Joseph (Boston University) · The Logic and Limits of Political Reform in China (Paperback Book) (2013)

The Logic and Limits of Politica... (2013)

Fewsmith, Joseph (Boston Univers...

Cover for Mylonas, Harris (Assistant Professor of Political Science and International Affairs, George Washington University, Washington DC) · The Politics of Nation-Building: Making Co-Nationals, Refugees, and Minorities - Problems of International Politics (Paperback Book) (2013)

The Politics of Nation-Building:... (2013)

Mylonas, Harris (Assistant Profe...

Cover for Iain Fenlon · The Italian Madrigal in the Early Sixteenth Century: Sources and Interpretation (Paperback Book) (2013)

The Italian Madrigal in the Earl... (2013)

Cover for Griffiths, Graham (City University London) · Stravinsky's Piano: Genesis of a Musical Language - Music since 1900 (Hardcover Book) (2013)

Stravinsky's Piano: Genesis of a... (2013)

Griffiths, Graham (City Universi...

Cover for White, Monica (University of Nottingham) · Military Saints in Byzantium and Rus, 900–1200 (Hardcover Book) (2013)

Military Saints in Byzantium and... (2013)

White, Monica (University of Not...

Cover for McCauley, Joseph L. (University of Houston) · Stochastic Calculus and Differential Equations for Physics and Finance (Hardcover Book) (2013)

Stochastic Calculus and Differen... (2013)

McCauley, Joseph L. (University ...

Cover for Jonathan Rougier · Risk and Uncertainty Assessment for Natural Hazards (Hardcover Book) (2013)

Risk and Uncertainty Assessment ... (2013)

Jonathan Rougier

Cover for Ekkekakis, Panteleimon (Iowa State University) · The Measurement of Affect, Mood, and Emotion: A Guide for Health-Behavioral Research (Hardcover Book) (2013)

The Measurement of Affect, Mood,... (2013)

Ekkekakis, Panteleimon (Iowa Sta...

Cover for George Richard Scott · Anthropological Perspectives on Tooth Morphology: Genetics, Evolution, Variation - Cambridge Studies in Biological and Evolutionary Anthropology (Hardcover Book) (2013)

Anthropological Perspectives on ... (2013)

George Richard Scott

Cover for Sen, Mrinal K. (University of Texas, Austin) · Global Optimization Methods in Geophysical Inversion (Hardcover Book) [Revised edition] (2013)

Revised edition

Global Optimization Methods in G... (2013)

Sen, Mrinal K. (University of Te...

Cover for Peter N Schlegel · Fertility Preservation in Male Cancer Patients (Hardcover Book) (2013)

Fertility Preservation in Male C... (2013)

Peter N Schlegel

Cover for Lesgourgues, Julien (Ecole Polytechnique Federale de Lausanne) · Neutrino Cosmology (Hardcover Book) (2013)

Neutrino Cosmology (2013)

Lesgourgues, Julien (Ecole Polyt...

Cover for Landau, Idan (Ben-Gurion University of the Negev, Israel) · Control in Generative Grammar: A Research Companion (Hardcover Book) (2013)

Control in Generative Grammar: A... (2013)

Landau, Idan (Ben-Gurion Univers...

Cover for Sally Morris · The Handbook of Journal Publishing (Hardcover Book) (2013)

The Handbook of Journal Publishing (2013)

Cover for Verba, Cynthia (Professor, Harvard University, Massachusetts) · Dramatic Expression in Rameau's Tragedie en Musique: Between Tradition and Enlightenment (Hardcover Book) (2013)

Dramatic Expression in Rameau's ... (2013)

Verba, Cynthia (Professor, Harva...

Cover for Green, R. M. (University of Colorado Boulder) · Combinatorics of Minuscule Representations - Cambridge Tracts in Mathematics (Hardcover Book) (2013)

Combinatorics of Minuscule Repre... (2013)

Green, R. M. (University of Colo...

Cover for Hobden, Fiona (University of Liverpool) · The Symposion in Ancient Greek Society and Thought (Hardcover Book) (2013)

The Symposion in Ancient Greek S... (2013)

Hobden, Fiona (University of Liv...

Cover for Duncan French · Statehood and Self-Determination: Reconciling Tradition and Modernity in International Law (Hardcover Book) (2013)

Statehood and Self-Determination... (2013)

Cover for Kollar, Janos (Princeton University, New Jersey) · Singularities of the Minimal Model Program - Cambridge Tracts in Mathematics (Hardcover Book) (2013)

Singularities of the Minimal Mod... (2013)

Kollar, Janos (Princeton Univers...

Cover for Reinhold Munker · The BMT Data Book: Including Cellular Therapy (Paperback Book) [3 Revised edition] (2013)

3 Revised edition

The BMT Data Book: Including Cel... (2013)

Reinhold Munker

Cover for Ekkekakis, Panteleimon (Iowa State University) · The Measurement of Affect, Mood, and Emotion: A Guide for Health-Behavioral Research (Paperback Book) (2013)

The Measurement of Affect, Mood,... (2013)

Ekkekakis, Panteleimon (Iowa Sta...

Cover for Banasiak, Jacek (University of KwaZulu-Natal, South Africa) · Mathematical Modelling in One Dimension: An Introduction via Difference and Differential Equations - AIMS Library of Mathematical Sciences (Paperback Book) (2013)

Mathematical Modelling in One Di... (2013)

Banasiak, Jacek (University of K...

Cover for Wenceslas Wratislaw · Adventures of Baron Wenceslas Wratislaw of Mitrowitz: What he Saw in the Turkish Metropolis, Constantinople; Experienced in his Captivity; And after his Happy Return to his Country, Committed to Writing in the Year of Our Lord 1599 - Cambridge Library Col (Paperback Book) (2013)

Adventures of Baron Wenceslas Wr... (2013)

Wenceslas Wratislaw

Cover for Mary Anne Barker · Colonial Memories - Cambridge Library Collection - British and Irish History, 19th Century (Paperback Book) (2013)

Colonial Memories - Cambridge Li... (2013)

Mary Anne Barker

Cover for Mariana Starke · Travels on the Continent: Written for the Use and Particular Information of Travellers - Cambridge Library Collection - Travel, Europe (Paperback Book) (2013)

Travels on the Continent: Writte... (2013)

Cover for Edward William Lane · An Account of the Manners and Customs of the Modern Egyptians: Written in Egypt during the Years 1833, –34, and –35, Partly from Notes Made during a Former Visit to that Country in the Years 1825, –26, –27 and –28 - Cambridge Library Collection - Perspect (Paperback Book) (2013)

An Account of the Manners and Cu... (2013)

Edward William Lane

Cover for Edward William Lane · An Account of the Manners and Customs of the Modern Egyptians: Written in Egypt during the Years 1833, –34, and –35, Partly from Notes Made during a Former Visit to that Country in the Years 1825, –26, –27 and –28 - Cambridge Library Collection - Perspect (Paperback Book) (2013)

An Account of the Manners and Cu... (2013)

Edward William Lane

Cover for John Evelyn · Sylva, Or, a Discourse of Forest Trees: With an Essay on the Life and Works of the Author - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

Sylva, Or, a Discourse of Forest... (2013)

Cover for John Evelyn · Sylva, Or, a Discourse of Forest Trees: With an Essay on the Life and Works of the Author - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

Sylva, Or, a Discourse of Forest... (2013)

Cover for James Croll · Discussions on Climate and Cosmology - Cambridge Library Collection - Earth Science (Paperback Book) (2013)

Discussions on Climate and Cosmo... (2013)

Cover for John Bentley · A Historical View of the Hindu Astronomy: From the Earliest Dawn of that Science in India to the Present Time - Cambridge Library Collection - South Asian History (Paperback Book) (2013)

A Historical View of the Hindu A... (2013)

Cover for Charles Cardale Babington · Memorials Journal and Botanical Correspondence of Charles Cardale Babington - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

Memorials Journal and Botanical ... (2013)

Charles Cardale Babington

Cover for Daniel Oliver · First Book of Indian Botany - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

First Book of Indian Botany - Ca... (2013)

Cover for Henrietta A. Hervey · Two Anglo-Indian Cookery Books - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

Two Anglo-Indian Cookery Books -... (2013)

Henrietta A. Hervey

Cover for Charles Cardale Babington · Manual of British Botany: Containing the Flowering Plants and Ferns Arranged According to the Natural Orders - Cambridge Library Collection - Botany and Horticulture (Paperback Book) (2013)

Manual of British Botany: Contai... (2013)

Charles Cardale Babington

Cover for Brian Houghton Hodgson · Essays on the Languages, Literature, and Religion of Nepal and Tibet: Together with Further Papers on the Geography, Ethnology, and Commerce of Those Countries - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

Essays on the Languages, Literat... (2013)

Brian Houghton Hodgson

Cover for James R. Ballantyne · A Synopsis of Science: From the Standpoint of the Nyaya Philosophy - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

A Synopsis of Science: From the ... (2013)

James R. Ballantyne

Cover for James R. Ballantyne · Synopsis of Science: From the Standpoint of the Nyaya Philosophy - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

Synopsis of Science: From the St... (2013)

James R. Ballantyne

Cover for Nathaniel Brassey Halhed · A Grammar of the Bengal Language - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

A Grammar of the Bengal Language... (2013)

Nathaniel Brassey Halhed

Cover for James R. Ballantyne · Christianity Contrasted with Hindu Philosophy: An Essay, in Five Books, Sanskrit and English - Cambridge Library Collection - Perspectives from the Royal Asiatic Society (Paperback Book) (2013)

Christianity Contrasted with Hin... (2013)

James R. Ballantyne

Cover for J. Frederic Daniell · Meteorological Essays and Observations - Cambridge Library Collection - Physical Sciences (Paperback Book) (2013)

Meteorological Essays and Observ... (2013)

J. Frederic Daniell

Cover for George Peacock · Life of Thomas Young M.D., F.R.S., etc.: And One of the Eight Foreign Associates of the National Institute of France - Cambridge Library Collection - Egyptology (Paperback Book) (2013)

Life of Thomas Young M.D., F.R.S... (2013)

Cover for Bram Stoker · Personal Reminiscences of Henry Irving - Personal Reminiscences of Henry Irving 2 Volume Set (Paperback Book) (2013)

Personal Reminiscences of Henry ... (2013)

Cover for Bram Stoker · Personal Reminiscences of Henry Irving - Personal Reminiscences of Henry Irving 2 Volume Set (Paperback Book) (2013)

Personal Reminiscences of Henry ... (2013)

Cover for Johann Wolfgang von Goethe · The Auto-Biography of Goethe: Truth and Poetry: From my Own Life - Cambridge Library Collection - Literary Studies (Paperback Book) (2013)

The Auto-Biography of Goethe: Tr... (2013)

Johann Wolfgang von Goethe

Cover for Johann Wolfgang von Goethe · The Auto-Biography of Goethe: Truth and Poetry: From my Own Life - Cambridge Library Collection - Literary Studies (Paperback Book) (2013)

The Auto-Biography of Goethe: Tr... (2013)

Johann Wolfgang von Goethe

Cover for Anna Letitia Le Breton · Memoir of Mrs Barbauld: Including Letters and Notices of her Family and Friends - Cambridge Library Collection - Literary Studies (Paperback Book) (2013)

Memoir of Mrs Barbauld: Includin... (2013)

Anna Letitia Le Breton

Cover for Tripp, Charles (Professor of Politics, University of London) · The Power and the People: Paths of Resistance in the Middle East (Paperback Book) (2013)

The Power and the People: Paths ... (2013)

Tripp, Charles (Professor of Pol...

Cover for Fricker, Ronald D. (Associate Professor, Naval Postgraduate School, Monterey, California) · Introduction to Statistical Methods for Biosurveillance: With an Emphasis on Syndromic Surveillance (Hardcover Book) (2013)

Introduction to Statistical Meth... (2013)

Fricker, Ronald D. (Associate Pr...

Cover for Smith, Mike (National Museum of Australia, Canberra) · The Archaeology of Australia's Deserts - Cambridge World Archaeology (Hardcover Book) (2013)

The Archaeology of Australia's D... (2013)

Smith, Mike (National Museum of ...

Cover for Tripp, Charles (Professor of Politics, University of London) · The Power and the People: Paths of Resistance in the Middle East (Hardcover Book) (2013)

The Power and the People: Paths ... (2013)

Tripp, Charles (Professor of Pol...

Cover for Coleman, Stephen (University of Leeds) · How Voters Feel (Hardcover Book) (2013)

How Voters Feel (2013)

Coleman, Stephen (University of ...

Cover for Joel P. Trachtman · The Future of International Law: Global Government - ASIL Studies in International Legal Theory (Hardcover Book) (2013)

The Future of International Law:... (2013)

Joel P. Trachtman

Cover for Michael Ruse · The Cambridge Encyclopedia of Darwin and Evolutionary Thought (Hardcover Book) (2013)

The Cambridge Encyclopedia of Da... (2013)

Cover for Fradkin, Eduardo (University of Illinois, Urbana-Champaign) · Field Theories of Condensed Matter Physics (Hardcover Book) [2 Revised edition] (2013)

2 Revised edition

Field Theories of Condensed Matt... (2013)

Fradkin, Eduardo (University of ...

Cover for Voinigescu, Sorin (University of Toronto) · High-Frequency Integrated Circuits - The Cambridge RF and Microwave Engineering Series (Hardcover Book) (2013)

High-Frequency Integrated Circui... (2013)

Voinigescu, Sorin (University of...

Cover for Weeks, William Earl (San Diego State University) · The New Cambridge History of American Foreign Relations - The New Cambridge History of American Foreign Relations 4 Volume Set (Hardcover Book) (2013)

The New Cambridge History of Ame... (2013)

Weeks, William Earl (San Diego S...

Cover for Shea, John J. (State University of New York, Stony Brook) · Stone Tools in the Paleolithic and Neolithic Near East: A Guide (Hardcover Book) (2013)

Stone Tools in the Paleolithic a... (2013)

Shea, John J. (State University ...

Cover for Bloomfield, Stephen (Anglia Ruskin University, Cambridge) · Theory and Practice of Corporate Governance: An Integrated Approach (Hardcover Book) (2013)

Theory and Practice of Corporate... (2013)

Bloomfield, Stephen (Anglia Rusk...

Cover for Hilpert, Martin (Universite de Neuchatel, Switzerland) · Constructional Change in English: Developments in Allomorphy, Word Formation, and Syntax - Studies in English Language (Hardcover Book) (2013)

Constructional Change in English... (2013)

Hilpert, Martin (Universite de N...

Cover for Olivier Godefroy · The Behavioral and Cognitive Neurology of Stroke (Hardcover Book) [2 Revised edition] (2013)

2 Revised edition

The Behavioral and Cognitive Neu... (2013)

Olivier Godefroy

Cover for Anthony Uhlmann · Samuel Beckett in Context - Literature in Context (Hardcover Book) (2013)

Samuel Beckett in Context - Lite... (2013)

Anthony Uhlmann

Cover for Buchenau, Stefanie (Maitre de conference, Universite de Paris VIII) · The Founding of Aesthetics in the German Enlightenment: The Art of Invention and the Invention of Art (Hardcover Book) (2013)

The Founding of Aesthetics in th... (2013)

Buchenau, Stefanie (Maitre de co...

Cover for Dorinda Outram · The Enlightenment (Hardcover Book) (2013)

The Enlightenment (2013)

Cover for Alpert, Michael (University of Westminster) · The Republican Army in the Spanish Civil War, 1936–1939 (Hardcover Book) (2013)

The Republican Army in the Spani... (2013)

Alpert, Michael (University of W...

Cover for Sellars, Kirsten (National University of Singapore) · 'Crimes against Peace' and International Law - Cambridge Studies in International and Comparative Law (Hardcover Book) (2013)

'Crimes against Peace' and Inter... (2013)

Sellars, Kirsten (National Unive...

Cover for Peter Sunderland · Objective Proficiency Workbook with Answers with Audio CD - Objective (Book) [2 Revised edition] (2013)

2 Revised edition

Objective Proficiency Workbook w... (2013)

Peter Sunderland

Cover for John Mawe · Travels in the Interior of Brazil: With Notices on its Climate, Agriculture, Commerce, Population, Mines, Manners, and Customs - Cambridge Library Collection - Latin American Studies (Paperback Book) (2013)

Travels in the Interior of Brazi... (2013)

Cover for Various Authors · The Nautical Magazine for 1832 - Cambridge Library Collection - The Nautical Magazine (Paperback Book) (2013)

The Nautical Magazine for 1832 -... (2013)

Various Authors