Book 516,794 Government Document 378,281 Serial 54,252 Map 29,702 Journal 15,924 Electronic 15,133 Conference Proceeding 14,409 Thesis 4,405 Audio 2,196 Unknown 794 Musical Score 776 Photo 687 Reference Material 528 Book Chapter 113 Manuscript 104 Kit 91 Article 34 Newspaper 29 Physical Object 6 see all ...

H - Social Science 86,115 Q - Science 35,696 S - Agriculture 33,475 T - Technology 32,272 G - Geography, Anthropology, Recreation 22,185 E - United States History 16,398 R - Medicine 15,939 L - Education 13,458 D - World History 10,460 K - Law 9,335 P - Language and Literature 6,956 J - Political Science 6,947 C - Historical Sciences 6,337 Z - Library Science 6,111 A - General Works 5,690 F - General American History 4,432 N - Fine Arts 3,129 U - Military Science 3,019 B - Philosophy, Psychology, Religion 2,826 M - Music 1,869 V - Naval Science 1,326 see all ...

Geological Survey (U.S.) 40,150 United States Bureau of the Census 24,200 Educational Resources Information Center (U.S.) 11,803 United States Department of State 11,601 United States Forest Service 10,100 United States Bureau of Mines 10,004 United States Department of the Army 9,870 United States National Bureau of Standards 9,765 United States Department of Agriculture 7,877 United States Bureau of Labor Statistics 5,914 United States 5,468 National Institute of Standards and Technology (U.S.) 5,329 United States Department of Energy 5,256 United States National Park Service 4,754 United States Internal Revenue Service 4,650 National Center for Education Statistics 4,341 United States Department of Agriculture. Economic Research Service 4,014 United States National Aeronautics and Space Administration 3,758 United States Agricultural Research Service 3,451 United States Soil Conservation Service 3,424 National Center for Health Statistics (U.S.) 3,288 U.S. Fish and Wildlife Service 3,274 United States Bureau of Land Management 3,249 United States Federal Highway Administration 2,992 National Institute of Justice (U.S.) 2,565 National Institutes of Health (U.S.) 2,309 Northeastern Forest Experiment Station (Radnor, Pa.) 2,096 United States Department of Housing and Urban Development 2,002 United States Office of Education 1,960 Pacific Northwest Research Station (Portland, Or.) 1,949 see all ...

English 610,328 Spanish 4,740 French 3,345 Russian 2,640 Undetermined 1,660 German 835 Chinese 721 Arabic 425 Malayalam 394 Portuguese 393 Hebrew 308 Swedish 308 Japanese 298 Indonesian 297 No linguistic content 281 Polish 278 Hindi 236 Italian 223 Multiple 217 Afrikaans 214 Sanskrit 176 Latin 174 Dutch 130 Korean 129 Thai 125 Austronesian 112 Greek 111 Tamil 110 Malay 108 Vietnamese 88 see all ...

Statistics 53,723 Periodicals 48,337 Maps 30,524 Handbooks, manuals, etc 16,276 Congresses 13,468 Bibliography 12,380 Technical reports 11,958 Conference papers and proceedings 9,472 History 5,600 Topographic maps 5,572 Directories 4,601 Government publications 4,517 Internet resource 4,507 Bibliographies 3,893 Handbooks and manuals 3,761 Catalogs 3,371 Census, 1990 2,516 Electronic books 2,394 Census, 1980 2,315 Databases 2,261 Academic dissertations 1,942 Abstracts 1,891 Tables 1,867 Maps, Topographic 1,791 Census, 20th, 1980 1,727 Statistiques 1,722 Census data 1,638 Classification 1,581 Case studies 1,546 Congress 1,488 see all ...

20th century 1,878 1945- 914 1900-1999 699 1980 568 19th century 534 1939-1945 499 Since 1945 383 1900 - 1999 332 Civil War, 1861-1865 328 Cretaceous 325 1990 302 1981-2001 248 1939 - 1945 246 Quaternary 219 Devonian 213 21st century 207 Paleozoic 198 18th century 194 Tertiary 193 Precambrian 188 Revolution, 1775-1783 188 Cenozoic 185 1960- 178 1945-1989 166 2000 161 1989- 157 Ordovician 150 1800-1899 149 1971-1981 149 Pleistocene 142 see all ...

United States 187,801 California 17,166 New York (State) 9,486 Canada 5,464 North Carolina 5,459 India 5,312 Alaska 5,298 Pennsylvania 4,820 Oregon 4,781 Washington (State) 4,630 Colorado 4,597 Texas 4,171 Illinois 3,987 Florida 3,910 Australia 3,757 Massachusetts 3,637 New Mexico 3,471 Arizona 3,459 New Jersey 3,301 Wisconsin 3,301 Alabama 2,949 Michigan 2,922 New Zealand 2,841 Montana 2,817 Idaho 2,765 Utah 2,702 Great Britain 2,644 Ohio 2,580 China 2,577 Nevada 2,544 see all ...