Book 81,951 Government Document 26,585 Serial 11,010 Journal 5,242 Electronic 4,548 Conference Proceeding 4,059 Thesis 1,247 Unknown 932 Kit 817 Reference Material 293 Audio 287 Manuscript 127 Map 100 Photo 42 Book Chapter 34 Article 12 Musical Score 1 Newspaper 1 Physical Object 1 see all ...

H - Social Science 16,014 Q - Science 12,215 K - Law 5,472 T - Technology 5,346 S - Agriculture 5,206 R - Medicine 5,181 L - Education 4,983 D - World History 3,539 G - Geography, Anthropology, Recreation 3,412 P - Language and Literature 2,772 C - Historical Sciences 1,821 Z - Library Science 1,498 J - Political Science 1,438 A - General Works 1,200 E - United States History 1,139 U - Military Science 895 B - Philosophy, Psychology, Religion 847 N - Fine Arts 806 F - General American History 443 M - Music 286 V - Naval Science 113 see all ...

ebrary, Inc 808 United States General Accounting Office 687 United States 674 National Science Foundation (U.S.) 670 Geological Survey (U.S.) 666 National Institutes of Health (U.S.) 574 United States Department of State 527 United States Congress 485 United States National Aeronautics and Space Administration 468 National Cancer Institute (U.S.) 312 United States Congress. Senate. Committee on Commerce, Science, and Transportation 306 Educational Resources Information Center (U.S.) 292 Rand Corporation 280 United States Department of Energy 279 United States Congress. Office of Technology Assessment 273 United States Agricultural Research Service 257 United States Government Accountability Office 252 National Institute of Education (U.S.) 250 Library of Congress Congressional Research Service 245 United States Congress. Senate. Committee on Energy and Natural Resources 240 University of Pennsylvania 240 United States Congress. Senate. Committee on Appropriations. Subcommittee on Departments of Labor, Health and Human Services, Education, and Related Agencies 235 United States Forest Service 224 United States Department of Agriculture 223 De Gruyter 217 United States Congress. House. Committee on Science 217 Ḳol Yiśraʼel 215 National Research Council (U.S.) 204 United States National Oceanic and Atmospheric Administration 192 Risk Reduction Engineering Laboratory (U.S.) 180 see all ...

English 75,973 German 4,655 Russian 4,058 Spanish 3,635 French 3,620 Chinese 1,539 Japanese 1,523 Portuguese 1,115 Italian 903 Indonesian 836 Hebrew 760 Arabic 726 Polish 585 Korean 518 Thai 451 Swedish 360 Dutch 335 Vietnamese 318 Czech 262 Bulgarian 254 Ukrainian 199 Danish 180 Multiple 167 Norwegian 163 Hungarian 152 Turkish 146 Finnish 120 Bosnian 119 Greek 118 Croatian 116 see all ...

Periodicals 11,860 History 6,130 Congresses 5,915 Conference papers and proceedings 4,444 Electronic books 3,597 Bibliography 2,622 Directories 2,234 Biography 1,548 Statistics 1,321 Case studies 1,234 Biographies 1,084 Bibliographies 986 Legislative hearings 808 Abstracts 711 Handbooks, manuals, etc 640 Periodical 639 Government publications 576 Congress 559 Electronic journals 466 Sources 463 Directory 455 Handbooks and manuals 391 Legislative materials 377 Catalogs 361 Criticism, interpretation, etc 350 Interviews 315 Treaties 314 Internet videos 262 Dictionaries 243 Documentary films 237 see all ...

20th century 2,072 1900-1999 922 21st century 621 19th century 507 1900 - 1999 261 2000-2099 225 1945- 207 20e siècle 199 1800-1899 149 18th century 139 1939-1945 131 1800-1999 98 Since 1945 93 1991- 86 21e siècle 70 17th century 68 20e siècle 63 1989- 54 1900-2099 52 1933-1945 51 19e siècle 51 To 1500 50 Since 1991 49 1700-1799 48 1945-1989 47 1942- 46 1947- 46 Geschichte 45 1935- 42 1936- 40 see all ...