Book 239,577 Government Document 93,393 Serial 13,084 Conference Proceeding 11,788 Journal 9,060 Electronic 6,043 Unknown 5,702 Map 5,319 Audio 1,548 Thesis 672 Reference Material 613 Kit 587 Photo 253 Musical Score 234 Newspaper 102 Manuscript 100 Book Chapter 69 Article 8 Physical Object 8 see all ...

H - Social Science 37,447 E - United States History 15,243 D - World History 13,393 T - Technology 12,271 Q - Science 12,114 N - Fine Arts 9,546 P - Language and Literature 8,779 K - Law 8,539 L - Education 7,825 R - Medicine 7,747 J - Political Science 5,518 B - Philosophy, Psychology, Religion 5,071 Z - Library Science 4,596 G - Geography, Anthropology, Recreation 4,482 F - General American History 3,798 U - Military Science 2,913 S - Agriculture 2,628 M - Music 1,362 C - Historical Sciences 1,303 A - General Works 1,004 V - Naval Science 617 see all ...

Educational Resources Information Center (U.S.) 11,871 Langley Research Center 6,884 National Center for Education Statistics 4,506 National Center for Health Statistics (U.S.) 3,539 United States Defense Mapping Agency. Hydrographic/Topographic Center 3,499 United States National Aeronautics and Space Administration 2,836 Lewis Research Center 2,781 Geological Survey (U.S.) 2,734 NASA Glenn Research Center 2,699 Goddard Space Flight Center 2,457 Ames Research Center 2,387 George C. Marshall Space Flight Center 1,831 Massachusetts Institute of Technology Center for Theoretical Physics 1,329 Federal Judicial Center 1,327 Center of Military History 1,285 Massachusetts Institute of Technology Center for International Studies 1,127 Organisation for Economic Co-operation and Development 1,084 Institute for Computer Applications in Science and Engineering 1,057 National Climatic Data Center (U.S.) 1,005 National Climatic Center 977 National Institute of Education (U.S.) 859 Rodney L. White Center for Financial Research 847 IEEE Xplore (Online service) 804 United States National Park Service 780 National Institute for Occupational Safety and Health 774 National Center for Jewish Film 763 Turner-Fairbank Highway Research Center 758 Aerospace Center (U.S.) 750 Institute of Electrical and Electronics Engineers 749 National Foreign Assessment Center (U.S.) 734 see all ...

English 265,240 Chinese 2,856 Spanish 2,455 French 1,725 German 1,032 Yiddish 849 Russian 827 Hebrew 824 Japanese 813 Arabic 685 Indonesian 622 Polish 401 Slovenian 397 Italian 324 Portuguese 315 Multiple 303 No linguistic content 295 Undetermined 270 Tagalog 265 Danish 253 Korean 225 Latin 207 Thai 190 Tibetan 181 Persian 180 Hungarian 155 Dutch 130 Turkish 125 Vietnamese 111 Croatian 99 see all ...

Periodicals 15,245 Statistics 13,454 Congresses 11,953 Conference papers and proceedings 8,921 History 8,232 Technical reports 7,388 Bibliography 6,432 Exhibitions 5,743 Electronic books 4,498 Maps 3,681 Exhibition catalogs 3,591 Handbooks, manuals, etc 3,383 Catalogs 2,694 Directories 2,473 Biography 2,352 Bibliographies 2,260 Case studies 1,699 Criticism, interpretation, etc 1,566 Handbooks and manuals 1,339 Biographies 1,304 Government publications 1,218 Tables 1,218 Databases 1,156 Pictorial works 971 Statistics, Medical 961 Documentary films 887 Sources 830 Indexes 825 Video recordings 801 Statistics, Vital 795 see all ...

20th century 5,373 1900-1999 2,038 21st century 1,575 1945- 1,075 1900 - 1999 1,026 19th century 970 1939-1945 719 2000-2099 613 Since 1945 531 1989- 505 18th century 356 1939 - 1945 325 1991- 324 1993- 313 1946- 293 1945-1989 283 1800-1899 263 20e siècle 263 1960- 247 Since 1989 247 17th century 244 1949- 216 Civil War, 1861-1865 214 1986- 198 16th century 181 1980- 179 1961-1975 176 1948- 172 World War, 1939-1945 172 1951- 170 see all ...

United States 65,194 China 4,598 California 3,909 Philippines 3,338 Japan 2,782 New York (State) 2,686 Israel 2,222 Soviet Union 2,115 Europe 1,534 Developing countries 1,496 Texas 1,451 Illinois 1,395 Indonesia 1,395 Latin America 1,352 Asia 1,320 India 1,300 Pennsylvania 1,273 New York 1,264 Mexico 1,247 Massachusetts 1,244 North Carolina 1,229 Africa 1,199 Middle East 1,104 Russia (Federation) 1,036 Alaska 1,004 Canada 992 Southeast Asia 947 Germany 942 Florida 881 Poland 878 see all ...