Book 416,825 Government Document 55,094 Conference Proceeding 33,949 Serial 18,712 Journal 17,923 Electronic 7,464 Unknown 6,458 Thesis 2,964 Musical Score 2,656 Map 1,754 Reference Material 1,342 Audio 1,335 Photo 248 Book Chapter 244 Manuscript 239 Kit 205 Newspaper 36 Article 18 Physical Object 9 see all ...

H - Social Science 81,530 T - Technology 40,022 Q - Science 39,780 K - Law 27,683 D - World History 23,666 P - Language and Literature 13,120 B - Philosophy, Psychology, Religion 12,121 J - Political Science 11,888 R - Medicine 10,304 N - Fine Arts 9,870 L - Education 8,077 G - Geography, Anthropology, Recreation 7,074 U - Military Science 6,129 Z - Library Science 5,857 S - Agriculture 5,355 M - Music 4,682 E - United States History 4,540 F - General American History 3,753 C - Historical Sciences 2,573 V - Naval Science 2,206 A - General Works 1,325 see all ...

Institute of Electrical and Electronics Engineers 6,757 Practising Law Institute 6,420 United States National Bureau of Standards 6,285 National Institute of Standards and Technology (U.S.) 5,682 National Institute of Justice (U.S.) 3,061 Army War College (U.S.) Strategic Studies Institute 2,542 National Institute for Occupational Safety and Health 2,347 American Law Institute 2,305 National Cancer Institute (U.S.) 2,257 United States National Aeronautics and Space Administration 2,183 IEEE Xplore (Online service) 1,907 British Film Institute 1,572 National Institute on Drug Abuse 1,505 American Institute of Physics 1,488 National Institute of Mental Health (U.S.) 1,472 National Institute of Law Enforcement and Criminal Justice 1,424 Massachusetts Institute of Technology Radiation Laboratory 1,347 Urban Institute 1,338 Massachusetts Institute of Technology Center for Theoretical Physics 1,328 Electric Power Research Institute 1,272 American Enterprise Institute for Public Policy Research 1,261 Sloan School of Management 1,210 American Law Institute-American Bar Association Committee on Continuing Professional Education 1,207 Jet Propulsion Laboratory (U.S.) 1,190 Art Institute of Chicago 1,152 National Institute of Education (U.S.) 1,149 Institute of Electrical and Electronics Engineers (IEEE) 1,127 Massachusetts Institute of Technology Laboratory for Information and Decision Systems 1,117 United States Institute of Peace 1,072 ebrary, Inc 1,066 see all ...

English 429,391 French 7,266 German 3,491 Spanish 3,205 Latin 2,511 Undetermined 2,030 Sanskrit 1,667 Hebrew 1,549 No linguistic content 1,242 Russian 1,197 Chinese 1,169 Arabic 1,108 Japanese 1,049 Indonesian 993 Italian 959 Austronesian 629 Tibetan 616 Multiple 596 Persian 581 Polish 573 Korean 539 Hindi 469 Greek 420 Tamil 418 Dutch 388 Portuguese 381 Swedish 368 Papuan 260 Niger-Kordofanian 250 Ukrainian 238 see all ...

Congresses 40,231 Technical reports 28,832 Conference papers and proceedings 27,118 Periodicals 22,793 History 13,434 Electronic books 12,800 Bibliography 7,990 Statistics 6,956 Exhibitions 4,930 Biography 3,815 Exhibition catalogs 3,476 Handbooks, manuals, etc 3,331 Case studies 3,272 Bibliographies 3,235 Catalogs 3,170 Criticism, interpretation, etc 2,928 Biographies 2,588 Internet videos 2,581 Directories 2,272 Maps 1,986 Handbooks and manuals 1,720 Congress 1,674 Electronic journals 1,664 Abstracts 1,600 Sources 1,502 Dictionaries 1,427 Video recordings 1,315 Periodical 1,289 Documentary films 1,250 Early works to 1800 1,238 see all ...

20th century 6,592 1900-1999 2,679 21st century 2,616 19th century 2,323 1945- 2,283 1900 - 1999 1,257 Since 1945 1,190 2000-2099 1,032 1989- 1,028 1939-1945 901 1960- 786 1991- 765 18th century 687 1945-1989 516 17th century 501 1800-1899 489 Since 1989 450 1939 - 1945 443 Since 1991 429 1993- 422 16th century 403 To 1500 394 1980- 388 1947- 378 500-1400 368 1949- 352 1975- 348 1979- 338 2000 - 2099 337 20e siècle 328 see all ...

United States 77,546 India 12,405 Great Britain 6,663 China 6,539 Europe 5,360 Canada 4,476 Japan 4,121 South Africa 3,560 Developing countries 3,500 California 3,140 Africa 3,101 Philippines 3,020 Israel 2,981 Australia 2,847 Asia 2,690 Indonesia 2,663 Pakistan 2,631 Illinois 2,590 Nigeria 2,535 Soviet Union 2,531 New York (State) 2,352 Southeast Asia 2,183 England 2,071 Middle East 2,009 Thailand 1,892 Germany 1,778 Massachusetts 1,743 Kenya 1,604 Malaysia 1,576 Latin America 1,532 see all ...