Book 2,044,271 Thesis 206,570 Conference Proceeding 133,875 Government Document 119,573 Electronic 96,356 Serial 76,110 Journal 54,715 Unknown 36,021 Audio 23,265 Kit 20,128 Book Chapter 12,934 Map 12,403 Musical Score 10,117 Manuscript 5,208 Reference Material 3,780 Newspaper 2,631 Photo 2,464 Physical Object 142 Article 124 see all ...

H - Social Science 309,620 T - Technology 258,987 Q - Science 142,613 D - World History 134,879 N - Fine Arts 118,993 P - Language and Literature 116,361 K - Law 89,805 B - Philosophy, Psychology, Religion 80,344 G - Geography, Anthropology, Recreation 68,301 J - Political Science 63,136 L - Education 53,686 R - Medicine 49,437 M - Music 31,435 S - Agriculture 29,639 Z - Library Science 28,512 E - United States History 24,335 F - General American History 23,243 C - Historical Sciences 16,411 U - Military Science 16,066 A - General Works 15,699 V - Naval Science 4,953 see all ...

Institute of Electrical and Electronics Engineers 35,838 Adam Matthew Digital (Firm) 24,754 Inter-university Consortium for Political and Social Research 13,809 Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science 11,555 De Gruyter 11,325 Massachusetts Institute of Technology Department of Mechanical Engineering 9,567 IEEE Xplore (Online service) 8,743 ebrary, Inc 8,378 International Monetary Fund 8,225 Sloan School of Management 7,445 United States National Bureau of Standards 7,265 SpringerLink (Online service) 7,046 Federal Financial Institutions Examination Council (U.S.) 6,834 National Institute of Standards and Technology (U.S.) 6,352 Practising Law Institute 6,340 Recorded Anthology of American Music, Inc 6,018 National Institutes of Health (U.S.) 5,029 American and French Research on the Treasury of the French Language (Project) 4,893 Committee on Institutional Cooperation 4,781 Smithsonian Institution 4,357 Indiana University Digital Library Program 4,284 Organisation for Economic Co-operation and Development 4,183 National Institute of Education (U.S.) 4,156 United States National Aeronautics and Space Administration 3,646 National Institute of Justice (U.S.) 3,602 Massachusetts Institute of Technology Department of Architecture 3,575 Harvard University Graduate School of Arts and Sciences 3,453 American Society for Testing and Materials 3,437 Taylor & Francis eBooks 3,415 American Law Institute 3,404 see all ...

English 1,687,779 Russian 177,659 French 146,518 German 137,829 Spanish 34,870 Italian 24,935 Latin 21,106 Chinese 16,202 Hebrew 14,088 No linguistic content 12,526 Dutch 9,798 Portuguese 9,304 Japanese 8,852 Arabic 7,618 Undetermined 7,325 Polish 6,322 Multiple 6,166 Indonesian 5,852 Bulgarian 5,108 Croatian 5,106 Danish 5,008 Korean 4,538 Catalan 4,369 Yiddish 3,821 Armenian 3,507 Ukrainian 3,358 Czech 3,228 Sanskrit 3,044 Swedish 2,929 Greek 2,842 see all ...

Congresses 180,180 Conference papers and proceedings 124,729 History 123,425 Electronic books 110,939 Exhibitions 97,322 Periodicals 78,804 Exhibition catalogs 74,416 Academic theses 41,202 Technical reports 33,979 Biography 31,723 Criticism, interpretation, etc 28,584 Bibliography 27,922 Statistics 25,941 Early works to 1800 25,722 Biographies 20,286 Catalogs 19,975 Correspondence 18,963 Dictionaries 16,587 Expositions 16,306 Sources 15,128 Records (Documents) 14,049 Maps 13,806 Internet videos 13,394 Case studies 13,322 Bibliographies 11,995 exhibition catalogs 11,591 Catalogues d'exposition 11,522 Directories 10,880 Congress 9,622 Nonfiction films 9,276 see all ...

20th century 71,659 21st century 32,859 1900-1999 29,534 19th century 27,207 2000-2099 14,231 Early works to 1800 12,454 1945- 9,901 18th century 9,871 1900 - 1999 9,368 20e siècle 7,980 1750-1806 7,916 1800-1899 7,525 17th century 7,259 16th century 6,745 1991- 5,950 21e siècle 5,552 Since 1945 4,849 1900-2099 4,800 1989- 4,797 1939-1945 4,123 1800-1999 4,109 To 1500 3,661 1960- 3,255 Since 1991 3,092 Revolution, 1917-1921 3,025 1700-1799 2,834 19e siècle 2,480 1800 - 1899 2,402 1945-1989 2,385 Since 1989 2,304 see all ...

United States 230,805 Russia (Federation) 40,325 Soviet Union 40,244 France 38,240 Europe 36,955 Germany 36,762 Great Britain 31,464 China 30,887 India 29,086 Italy 18,171 Russia 17,922 Japan 16,386 Canada 15,660 Africa 13,640 Developing countries 12,316 England 12,271 New York (State) 12,008 Asia 10,514 European Union countries 10,487 Israel 10,306 California 9,804 Massachusetts 9,149 Latin America 9,072 Indonesia 8,910 Spain 8,698 États-Unis 8,634 Middle East 8,370 Poland 8,258 Mexico 8,218 South Africa 8,139 see all ...