Book 603,848 Conference Proceeding 345,561 Government Document 8,774 Serial 8,049 Journal 2,254 Electronic 2,198 Audio 377 Unknown 287 Manuscript 226 Thesis 136 Book Chapter 117 Kit 104 Article 76 Reference Material 14 Musical Score 8 Map 4 Newspaper 4 Photo 4 see all ...

Q - Science 106,364 T - Technology 89,791 H - Social Science 79,622 P - Language and Literature 55,691 D - World History 48,522 B - Philosophy, Psychology, Religion 38,426 R - Medicine 26,109 K - Law 22,330 J - Political Science 17,044 N - Fine Arts 15,056 G - Geography, Anthropology, Recreation 14,602 L - Education 11,132 S - Agriculture 9,612 M - Music 6,935 Z - Library Science 6,601 F - General American History 5,906 C - Historical Sciences 5,461 E - United States History 3,174 A - General Works 3,133 U - Military Science 2,914 V - Naval Science 1,193 see all ...

IEEE Xplore (Online service) 13,787 Society of Photo-optical Instrumentation Engineers 9,875 Institute of Electrical and Electronics Engineers 8,808 IEEE Computer Society 4,191 Society of Photo-Optical Instrumentation Engineers 3,847 North Atlantic Treaty Organization Scientific Affairs Division 2,176 Association for Computing Machinery 2,157 ACM Digital Library 2,025 American Society for Testing and Materials 1,644 George Clapp Vaillant Book Fund 1,412 SPIE (Society) 1,302 National Science Foundation (U.S.) 1,102 Unesco 1,096 International Labour Office 1,071 IEEE Communications Society 1,067 De Gruyter 1,042 Society of Automotive Engineers 1,038 IEEE Electron Devices Society 1,036 United States National Aeronautics and Space Administration 999 American Society of Mechanical Engineers Winter Annual Meeting 951 Organisation for Economic Co-operation and Development 943 Food and Agriculture Organization of the United Nations 904 American Chemical Society Meeting 897 Centre national de la recherche scientifique (France) 758 New York Academy of Sciences 757 American Society of Mechanical Engineers 733 Alumni and Friends Memorial Book Fund 732 Materials Research Society Fall Meeting 725 International Atomic Energy Agency 706 World Health Organization 702 see all ...

English 432,832 French 68,350 German 61,879 Italian 34,951 Spanish 33,655 Russian 23,931 Chinese 8,120 Arabic 7,098 Portuguese 6,626 Polish 4,585 Indonesian 4,020 Turkish 3,543 Japanese 2,822 Ukrainian 1,993 Hebrew 1,905 Multiple 1,678 Czech 1,672 Greek 1,612 Dutch 1,475 Korean 1,390 Hindi 1,205 Catalan 1,135 Croatian 1,037 Latin 1,037 Persian 977 Vietnamese 970 Swedish 831 Thai 825 Slovak 803 Bulgarian 779 see all ...

20th century 20,117 1900-1999 11,723 19th century 6,873 21st century 5,086 1900 - 1999 4,154 18th century 3,821 To 1500 3,608 1945- 2,852 2000-2099 2,615 1800-1899 2,542 17th century 2,525 16th century 2,400 Since 1945 1,841 20e siècle 1,808 1800-1999 1,727 1700-1799 1,591 1991- 1,530 1939-1945 1,498 Since 1991 1,272 1989- 1,233 Geschichte 1,069 Middle Ages, 600-1500 1,035 1800 - 1899 944 1900-2099 919 Since 1989 842 1500-1599 813 1600-1699 737 1960- 723 21e siècle 672 19e siècle 659 see all ...

United States 29,345 Europe 22,359 Italy 14,253 Germany 13,570 France 10,852 India 9,952 Russia (Federation) 8,806 China 7,571 Latin America 7,061 Spain 6,098 Asia 5,465 Soviet Union 4,765 Africa 4,714 Great Britain 4,351 Indonesia 4,265 Developing countries 3,919 Canada 3,579 Turkey 3,569 Japan 3,346 Poland 3,331 European Union countries 3,319 Mexico 3,305 Middle East 3,123 Russia 3,037 Rome 2,872 Greece 2,854 Europe, Eastern 2,842 Brazil 2,827 Mediterranean Region 2,318 Southeast Asia 2,304 see all ...