Book 7,228 Government Document 585 Book Chapter 308 Conference Proceeding 116 Electronic 91 Thesis 83 Serial 67 Journal 55 Unknown 44 Map 16 Audio 13 Photo 7 Reference Material 5 Kit 4 see all ...

Audubon, John James, 1785-1851 157 National Audubon Society 123 Geological Survey (U.S.) 110 Smithsonian Institution 105 American Ornithologists' Union 84 Bent, Arthur Cleveland, 1866-1954 74 Cornell University Laboratory of Ornithology 71 Lownes Science Collection (Brown University) 59 Academy of Natural Sciences of Philadelphia 57 U.S. Fish and Wildlife Service 55 National Wildlife Federation 52 De Gruyter 51 Peterson, Roger Tory, 1908-1996 51 ebrary, Inc 50 History of Science Collection (Brown University) 49 Geological Society of America 44 National Geographic Society (U.S.) 43 Baird, Spencer Fullerton, 1823-1887 42 United States National Museum 40 Nuttall, Thomas, 1786-1859 37 Coues, Elliott, 1842-1899 36 Gray, Asa, 1810-1888 33 Rafinesque, C. S (Constantine Samuel), 1783-1840 33 Elliot, Daniel Giraud, 1835-1915 32 Say, Thomas, 1787-1834 32 Allen, J. A (Joel Asaph), 1838-1921 31 Jordan, David Starr, 1851-1931 31 Ridgway, Robert, 1850-1929 31 Beutenmüller, William 30 Chapman, Frank M (Frank Michler), 1864-1945 28 see all ...

English 7,556 French 93 Latin 61 German 58 Spanish 34 Russian 9 Swedish 5 Chinese 4 Multiple 4 No linguistic content 4 Portuguese 3 Italian 2 Japanese 2 Danish 1 North American Indian 1 see all ...

Identification 676 Classification 492 Guidebooks 461 Field guides 423 Pictorial works 419 Electronic books 223 Congresses 173 Conference papers and proceedings 147 Bibliography 140 History 105 Illustrated works 105 Periodicals 94 Terminology 85 Nomenclature 81 Biography 73 Dictionaries 72 Bibliographies 63 Catalogs 63 Catalogs and collections 63 Biographies 55 Juvenile literature 52 Maps 46 Academic theses 35 Identification guides 32 Juvenile works 32 Directories 31 Ouvrages illustrés 28 Handbooks and manuals 27 Handbooks, manuals, etc 27 Reference works 27 see all ...

1785-1851 66 Tertiary 65 Cretaceous 55 Cenozoic 53 Paleozoic 50 Pleistocene 47 Quaternary 36 Mesozoic 34 19th century 32 From 10 thousand to 2 million years ago 32 From 2 to 65 million years ago 32 Eocene 30 From 230 to 570 million years ago 27 Devonian 25 From 65 to 140 million years ago 25 Ordovician 25 From 2 million years ago 24 Jurassic 24 From 65 million years ago 23 Precambrian 19 Silurian 19 Triassic 18 From 65 to 230 million years ago 17 Carboniferous 16 Permian 15 Cambrian 13 Paleocene 13 From 345 to 405 million years ago 12 Miocene 12 From 570 million to 5 billion years ago 11 see all ...