Book 295,569 Conference Proceeding 41,662 Serial 23,727 Journal 21,943 Electronic 14,492 Audio 10,040 Map 5,108 Musical Score 2,931 Unknown 2,560 Book Chapter 1,549 Government Document 824 Thesis 693 Kit 449 Photo 257 Reference Material 217 Newspaper 168 Manuscript 90 Article 52 Physical Object 12 see all ...

Q - Science 52,914 T - Technology 38,120 B - Philosophy, Psychology, Religion 26,203 D - World History 17,247 P - Language and Literature 16,602 H - Social Science 15,615 F - General American History 14,556 M - Music 10,318 G - Geography, Anthropology, Recreation 9,509 E - United States History 7,337 N - Fine Arts 6,934 R - Medicine 6,593 S - Agriculture 5,293 C - Historical Sciences 5,161 Z - Library Science 5,044 K - Law 4,439 L - Education 3,347 A - General Works 2,367 J - Political Science 2,150 V - Naval Science 772 U - Military Science 761 see all ...

IEEE Computer Society 5,828 IEEE Xplore (Online service) 4,065 Society of Photo-optical Instrumentation Engineers 2,700 American Tract Society 2,308 Institute of Electrical and Electronics Engineers 2,114 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 1,742 Royal Society of Chemistry (Great Britain) 1,566 American Society for Testing and Materials 1,555 Society of Automotive Engineers 1,387 American Society of Mechanical Engineers 1,286 American Mathematical Society 1,096 ebrary, Inc 1,071 American Society of Civil Engineers 1,007 American Chemical Society 916 Society for Industrial and Applied Mathematics 912 National Geographic Society (U.S.) Cartographic Division 891 Society for Promoting Christian Knowledge (Great Britain) 859 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 332,009 No linguistic content 4,053 French 3,799 Latin 3,516 German 2,960 Russian 2,160 Hebrew 1,643 Undetermined 1,618 Spanish 1,310 Ancient Greek 1,253 Sanskrit 1,111 Japanese 973 Italian 906 Chinese 813 Arabic 701 Middle English 521 Pali 505 Multiple 463 Persian 443 Austronesian 406 Hindi 395 Greek 374 Swedish 336 Tamil 321 Korean 304 Portuguese 272 Irish 211 Bengali 209 Niger-Kordofanian 207 Dutch 198 see all ...

Congresses 51,479 Conference papers and proceedings 39,546 Periodicals 27,693 History 22,138 Electronic books 13,158 Biography 9,098 Electronic journals 6,052 Sources 5,784 Biographies 5,226 Maps 5,173 Bibliography 5,133 Genealogy 4,012 Early works to 1800 3,742 Periodical 3,119 Catalogs 2,863 Fiction 2,783 Texts 2,720 Criticism, interpretation, etc 2,552 Exhibitions 2,524 Bibliographies 2,370 Directories 1,929 Guidebooks 1,870 Congress 1,823 Early works 1,720 Pictorial works 1,681 Exhibition catalogs 1,595 Handbooks, manuals, etc 1,588 Sermons 1,560 Sound recordings 1,522 Périodiques 1,427 see all ...

19th century 4,037 20th century 3,699 18th century 1,821 1900-1999 1,361 Civil War, 1861-1865 1,345 1800-1899 1,250 Colonial period, ca. 1600-1775 1,172 Early works to 1800 1,151 17th century 1,074 Revolution, 1775-1783 1,024 16th century 712 1900 - 1999 604 21st century 550 1700-1799 488 1800 - 1899 469 To 1500 466 1861-1865 444 1809-1865 409 1564-1616 377 Middle English, 1100-1500 339 1775-1783 325 1600-1775 322 1945- 322 1600-1699 321 Cretaceous 310 1939-1945 283 1861 - 1865 281 Paleozoic 274 1914-1918 253 1500-1599 222 see all ...

United States 20,880 Great Britain 13,396 England 12,798 India 5,842 New York (State) 3,595 Massachusetts 3,065 Pennsylvania 3,035 Canada 2,641 China 2,252 Scotland 2,131 Australia 1,972 California 1,940 Japan 1,847 Ireland 1,730 London 1,694 New York 1,682 Europe 1,318 North America 1,307 Africa 1,225 France 1,164 Wisconsin 1,133 New Zealand 1,068 Ohio 962 Minnesota 958 South Africa 928 Philadelphia 925 Soviet Union 905 Asia 892 Middle East 883 Illinois 837 see all ...