Book 296,084 Conference Proceeding 41,727 Serial 23,737 Journal 21,958 Electronic 14,492 Audio 10,040 Map 5,116 Musical Score 2,931 Unknown 2,560 Book Chapter 1,549 Government Document 826 Thesis 693 Kit 449 Photo 259 Reference Material 218 Newspaper 168 Manuscript 90 Article 52 Physical Object 12 see all ...

Q - Science 53,208 T - Technology 38,134 B - Philosophy, Psychology, Religion 26,211 D - World History 17,272 P - Language and Literature 16,623 H - Social Science 15,628 F - General American History 14,567 M - Music 10,318 G - Geography, Anthropology, Recreation 9,525 E - United States History 7,351 N - Fine Arts 6,945 R - Medicine 6,601 S - Agriculture 5,297 C - Historical Sciences 5,170 Z - Library Science 5,060 K - Law 4,450 L - Education 3,352 A - General Works 2,368 J - Political Science 2,152 V - Naval Science 773 U - Military Science 764 see all ...

IEEE Computer Society 5,848 IEEE Xplore (Online service) 4,065 Society of Photo-optical Instrumentation Engineers 2,692 American Tract Society 2,308 Institute of Electrical and Electronics Engineers 2,125 American Chemical Society Meeting 1,931 Religious Tract Society (Great Britain) 1,884 Geological Society of America 1,781 Society of Photo-Optical Instrumentation Engineers 1,763 Royal Society of Chemistry (Great Britain) 1,567 American Society for Testing and Materials 1,555 Society of Automotive Engineers 1,387 American Society of Mechanical Engineers 1,286 American Mathematical Society 1,101 ebrary, Inc 1,072 American Society of Civil Engineers 1,008 American Chemical Society 917 Society for Industrial and Applied Mathematics 912 National Geographic Society (U.S.) Cartographic Division 892 Society for Promoting Christian Knowledge (Great Britain) 860 Yarnall Collection (University of Pennsylvania) 859 American Society of Mechanical Engineers Winter Annual Meeting 840 Geological Society of London 808 Royal Geographical Society (Great Britain) 804 Adam Matthew Digital (Firm) 801 American Bible Society 799 National Geographic Society (U.S.) 748 Materials Research Society Fall Meeting 745 Royal Society (Great Britain) 742 American Geographical Society of New York 724 see all ...

English 332,500 No linguistic content 4,053 French 3,801 Latin 3,518 German 2,961 Russian 2,163 Hebrew 1,645 Undetermined 1,620 Spanish 1,313 Ancient Greek 1,254 Sanskrit 1,112 Japanese 976 Italian 906 Chinese 814 Arabic 702 Middle English 522 Pali 505 Multiple 463 Persian 443 Austronesian 407 Hindi 395 Greek 374 Swedish 336 Tamil 321 Korean 304 Portuguese 272 Irish 211 Bengali 209 Niger-Kordofanian 207 Dutch 198 see all ...

Congresses 51,562 Conference papers and proceedings 39,586 Periodicals 27,721 History 22,185 Electronic books 13,163 Biography 9,109 Electronic journals 6,689 Sources 5,788 Biographies 5,242 Maps 5,179 Bibliography 5,143 Genealogy 4,014 Early works to 1800 3,745 Periodical 3,112 Catalogs 2,865 Fiction 2,785 Texts 2,722 Criticism, interpretation, etc 2,553 Exhibitions 2,532 Bibliographies 2,372 Directories 1,929 Guidebooks 1,871 Congress 1,823 Early works 1,722 Pictorial works 1,682 Exhibition catalogs 1,607 Handbooks, manuals, etc 1,589 Sermons 1,561 Sound recordings 1,523 Périodiques 1,506 see all ...

19th century 4,049 20th century 3,716 18th century 1,822 1900-1999 1,366 Civil War, 1861-1865 1,349 1800-1899 1,255 Colonial period, ca. 1600-1775 1,172 Early works to 1800 1,151 17th century 1,076 Revolution, 1775-1783 1,025 16th century 715 1900 - 1999 605 21st century 553 1700-1799 489 1800 - 1899 469 To 1500 468 1861-1865 449 1809-1865 409 1564-1616 377 Middle English, 1100-1500 339 1775-1783 324 1600-1775 322 1945- 322 1600-1699 321 Cretaceous 310 1939-1945 285 1861 - 1865 281 Paleozoic 274 1914-1918 256 1500-1599 223 see all ...

United States 20,905 Great Britain 13,403 England 12,801 India 5,849 New York (State) 3,596 Massachusetts 3,066 Pennsylvania 3,035 Canada 2,641 China 2,256 Scotland 2,133 Australia 1,972 California 1,942 Japan 1,848 Ireland 1,732 London 1,693 New York 1,681 Europe 1,321 North America 1,310 Africa 1,226 France 1,165 Wisconsin 1,134 New Zealand 1,068 Minnesota 970 Ohio 964 South Africa 928 Philadelphia 925 Soviet Union 906 Asia 892 Middle East 882 Illinois 837 see all ...