Book 208,723 Conference Proceeding 123,445 Serial 3,650 Government Document 3,484 Journal 1,027 Electronic 660 Audio 172 Unknown 102 Kit 86 Thesis 67 Article 37 Book Chapter 35 Photo 16 Reference Material 11 Manuscript 9 Map 2 Musical Score 2 see all ...

Q - Science 39,758 H - Social Science 30,794 T - Technology 28,368 P - Language and Literature 13,774 D - World History 12,166 R - Medicine 11,672 B - Philosophy, Psychology, Religion 9,432 J - Political Science 5,474 G - Geography, Anthropology, Recreation 4,664 S - Agriculture 4,545 L - Education 4,283 K - Law 4,238 N - Fine Arts 2,796 Z - Library Science 2,620 F - General American History 2,071 M - Music 1,886 A - General Works 1,469 C - Historical Sciences 1,343 E - United States History 1,333 U - Military Science 989 V - Naval Science 217 see all ...

Society of Photo-optical Instrumentation Engineers 5,180 Society of Photo-Optical Instrumentation Engineers 3,226 IEEE Xplore (Online service) 2,015 North Atlantic Treaty Organization Scientific Affairs Division 1,738 Institute of Electrical and Electronics Engineers 1,375 American Society of Mechanical Engineers Winter Annual Meeting 815 IEEE Computer Society 807 Unesco 695 National Science Foundation (U.S.) 601 International Labour Office 579 American Chemical Society Meeting 575 Food and Agriculture Organization of the United Nations 526 International Atomic Energy Agency 526 American Society of Mechanical Engineers Winter Meeting 525 New York Academy of Sciences 493 Centre national de la recherche scientifique (France) 492 Organisation for Economic Co-operation and Development 488 World Health Organization 434 United States National Aeronautics and Space Administration 424 American Society of Mechanical Engineers Heat Transfer Division 406 Commission of the European Communities 401 American Society of Mechanical Engineers Pressure Vessels and Piping Division 378 American Society of Mechanical Engineers 366 Council of Europe 360 IEEE Electron Devices Society 340 International Federation of Automatic Control 326 De Gruyter 303 American Society of Mechanical Engineers Fluids Engineering Division 296 Ciba Foundation 290 American Society of Mechanical Engineers Applied Mechanics Division 288 see all ...

English 164,456 French 21,818 German 17,811 Spanish 10,908 Italian 8,967 Russian 5,798 Indonesian 2,206 Chinese 1,977 Portuguese 1,970 Arabic 1,669 Polish 984 Japanese 963 Hebrew 712 Turkish 695 Thai 515 Multiple 482 Greek 462 Dutch 459 Czech 447 Croatian 376 Latin 341 Ukrainian 326 Malay 248 Bulgarian 247 Swedish 241 Catalan 233 Hindi 221 Korean 207 Slovak 206 Persian 187 see all ...

20th century 4,665 1900-1999 2,320 1900 - 1999 1,677 1945- 1,625 19th century 1,516 18th century 1,049 Since 1945 1,004 17th century 609 1800-1899 517 16th century 509 1989- 459 1700-1799 416 1939-1945 347 To 1500 338 1800 - 1899 330 1960- 327 Revolution, 1789-1799 324 Middle Ages, 600-1500 288 1700 - 1799 287 1800-1999 286 1976- 278 1991- 278 1980- 277 Since 1989 266 1945-1989 237 1939 - 1945 224 Medieval, 500-1500 212 1800 - 1999 196 1990- 194 20e siècle 192 see all ...

United States 14,084 Europe 6,499 Italy 3,580 India 3,108 France 2,946 Latin America 2,909 Germany 2,897 Asia 2,495 Indonesia 2,262 Developing countries 2,114 Soviet Union 2,040 Great Britain 1,958 China 1,887 Canada 1,820 Africa 1,793 Spain 1,537 Germany (West) 1,321 Japan 1,279 Russia (Federation) 1,158 Southeast Asia 1,154 Mexico 1,033 Brazil 957 Europe, Eastern 929 Middle East 889 Australia 824 Pacific Area 771 Turkey 771 European Economic Community countries 726 Poland 724 Greece 661 see all ...