Book 474,782 Thesis 44,783 Electronic 42,401 Conference Proceeding 38,120 Government Document 18,103 Unknown 14,399 Kit 13,012 Journal 12,283 Physical Object 9,471 Serial 7,928 Map 7,240 Manuscript 4,067 Audio 2,841 Book Chapter 1,284 Photo 687 Reference Material 401 Musical Score 225 Article 48 Newspaper 14 see all ...

Q - Science 168,822 T - Technology 61,289 R - Medicine 32,034 G - Geography, Anthropology, Recreation 30,060 H - Social Science 24,117 B - Philosophy, Psychology, Religion 16,425 P - Language and Literature 14,587 L - Education 6,990 D - World History 6,724 A - General Works 6,319 N - Fine Arts 5,966 M - Music 5,608 S - Agriculture 4,116 K - Law 3,202 Z - Library Science 3,115 F - General American History 2,553 E - United States History 2,233 C - Historical Sciences 2,096 U - Military Science 2,091 J - Political Science 1,593 V - Naval Science 519 see all ...

SpringerLink (Online service) 16,796 Princeton University Plasma Physics Laboratory 5,327 De Gruyter 4,429 ebrary, Inc 3,875 Films for the Humanities & Sciences (Firm) 3,117 Society of Photo-optical Instrumentation Engineers 3,095 Films Media Group 3,052 Princeton University Department of Physics 2,650 Massachusetts Institute of Technology Department of Physics 2,475 Yale University 2,358 ProQuest (Firm) 2,251 Adam Matthews Digital (Firm) 2,045 Society of Photo Optical Instrumentation Engineers 1,909 World Scientific (Firm) 1,887 American Institute of Physics 1,841 Inter-university Consortium for Political and Social Research 1,774 Stanford University Department of Physics 1,715 American Society for Testing and Materials 1,694 ASTM International 1,641 Geological Survey (U.S.) 1,528 United States National Aeronautics and Space Administration 1,528 Adam Matthew Digital (Firm) 1,519 Massachusetts Institute of Technology Center for Theoretical Physics 1,332 North Atlantic Treaty Organization Scientific Affairs Division 1,283 U.S. Atomic Energy Commission 1,224 Institute of Electrical and Electronics Engineers 1,114 University of Pennsylvania 982 Taylor & Francis 959 SPIE (Society) 892 Stanford University Department of Applied Physics 891 see all ...

English 484,497 German 19,512 French 14,664 Russian 8,989 No linguistic content 5,618 Spanish 4,703 Italian 3,823 Latin 3,762 Chinese 3,378 Arabic 2,549 Multiple 2,154 Japanese 1,903 Hebrew 1,806 Undetermined 1,392 Persian 1,173 Portuguese 1,074 Dutch 853 Polish 829 Ancient Greek 747 Korean 683 Czech 533 Swedish 473 Greek 448 Turkish 439 Ottoman Turkish 339 Ukrainian 335 Danish 330 Indonesian 315 Hungarian 280 Romanian 276 see all ...

Electronic books 63,381 Congresses 47,566 Conference papers and proceedings 31,647 History 15,997 Periodicals 15,620 Early works to 1800 8,715 Internet videos 8,117 Maps 7,562 Biography 6,455 Academic theses 4,704 Biographies 4,699 Dictionaries 4,552 Handbooks, manuals, etc 4,545 Educational films 4,508 Early works 3,548 Criticism, interpretation, etc 3,427 Handbooks and manuals 3,366 Physical maps 3,207 Textbooks 2,914 Fiction 2,775 Bibliography 2,762 Academic dissertations 2,740 Technical reports 2,484 Sound recordings 2,389 Congrès 2,322 Congress 2,170 Video recordings 2,103 Statistics 2,015 Case studies 1,999 Popular works 1,897 see all ...

20th century 8,477 19th century 5,053 1900-1999 2,768 Early works to 1800 2,624 21st century 2,458 18th century 2,311 17th century 1,611 1879-1955 1,245 2000-2099 1,192 1900 - 1999 1,118 1800-1899 1,093 16th century 759 20e siècle 660 To 1500 650 1642-1727 569 1700-1799 406 21e siècle 389 1800 - 1899 382 15th century 378 1939-1945 358 1800-1999 351 19e siècle 346 1945- 340 Civil War, 1861-1865 306 1900-2099 300 20e siècle 300 1600-1699 296 1564-1616 261 14th century 255 Geschichte 236 see all ...

United States 27,780 Great Britain 5,187 China 3,306 New York (State) 3,168 Germany 2,950 England 2,874 Europe 2,615 New Jersey 2,322 France 2,264 Princeton 2,046 India 2,002 Japan 1,665 New York 1,575 California 1,533 Italy 1,490 Israel 1,426 Soviet Union 1,415 Canada 1,390 États-Unis 1,355 Massachusetts 1,103 Australia 1,098 Mexico 1,072 Russia (Federation) 1,012 États-Unis 927 Africa 918 Earth (Planet) 871 Greece 869 Pennsylvania 838 Asia 809 Brazil 802 see all ...