Book 18,020 Government Document 1,784 Electronic 1,632 Conference Proceeding 475 Map 448 Unknown 448 Serial 344 Journal 285 Book Chapter 231 Thesis 201 Kit 140 Audio 122 Reference Material 79 Photo 70 Musical Score 22 Manuscript 19 Physical Object 15 Newspaper 3 Article 1 see all ...

E - United States History 3,744 Q - Science 3,344 H - Social Science 1,851 P - Language and Literature 1,189 F - General American History 877 G - Geography, Anthropology, Recreation 839 K - Law 691 S - Agriculture 502 B - Philosophy, Psychology, Religion 404 N - Fine Arts 383 T - Technology 332 J - Political Science 318 Z - Library Science 288 M - Music 210 R - Medicine 206 C - Historical Sciences 140 L - Education 118 A - General Works 105 D - World History 92 U - Military Science 37 V - Naval Science 26 see all ...

Levine, Janet 327 Sigrist, Paul E 259 Geological Survey (U.S.) 197 De Gruyter 165 Audubon, John James, 1785-1851 119 American Ornithologists' Union 112 ebrary, Inc 110 Dallett, Nancy 87 Smithsonian Institution 87 National Audubon Society 85 Smithsonian Institution Bureau of American Ethnology 82 Bent, Arthur Cleveland, 1866-1954 77 Gotham Book Mart Collection (University of Pennsylvania) 77 Geological Society of America 74 George Clapp Vaillant Book Fund 72 U.S. Fish and Wildlife Service 71 Academy of Natural Sciences of Philadelphia 69 Caroline F. Schimmel Collection of Women in the American Wilderness (University of Pennsylvania) 69 United States Congress 69 Nash, Margo 65 Cornell University Laboratory of Ornithology 62 Say, Thomas, 1787-1834 53 Adam Matthew Digital (Firm) 52 American Council of Learned Societies 52 EBSCOhost 51 Coues, Elliott, 1842-1899 50 Gray, Asa, 1810-1888 50 United States Congress. Senate. Committee on Foreign Relations 49 Decade of North American Geology Project 47 ProQuest (Firm) 46 see all ...

English 19,099 Spanish 1,023 French 386 German 116 Multiple 82 Latin 42 Undetermined 39 Russian 35 Portuguese 31 Italian 30 North American Indian 28 No linguistic content 23 Japanese 22 Chinese 19 Dutch 10 Algonquian 8 Hebrew 8 Icelandic 8 Arabic 7 Ojibwa 7 Dakota 6 Swedish 6 Iroquoian 5 Central American Indian 4 Czech 4 Polish 4 Inuktitut 3 Korean 3 Nahuatl 3 Norwegian 3 see all ...

History 2,004 Electronic books 1,494 Maps 652 Congresses 641 Conference papers and proceedings 526 Bibliography 514 Pictorial works 490 Biography 478 Periodicals 454 Fiction 416 Exhibitions 407 Biographies 384 Criticism, interpretation, etc 365 Catalogs 340 Exhibition catalogs 309 Folklore 305 Classification 291 Bibliographies 267 Identification 265 Early works to 1800 260 Directories 251 Dictionaries 238 Guidebooks 236 Field guides 173 Poetry 169 Statistics 164 Illustrated works 160 Legislative hearings 150 Documentary films 143 Music 142 see all ...

20th century 639 19th century 506 1900-1999 326 Colonial period, ca. 1600-1775 267 18th century 231 21st century 231 1900 - 1999 147 2000-2099 137 1800-1899 122 Revolution, 1775-1783 121 17th century 78 To 1763 (New France) 74 1600-1775 72 20e siècle 71 1775-1783 60 Early works to 1800 57 21e siècle 51 1700-1799 48 1700-1899 47 1800-1999 47 1800 - 1899 46 20e siècle 42 19e siècle 40 To 1763 40 To 1775 40 1789-1869 38 19e siècle 36 1785-1851 35 2000 - 2099 34 Paleozoic 34 see all ...