Audubon, John James, 1785-1851 154 National Audubon Society 108 Smithsonian Institution 102 Geological Survey (U.S.) 96 American Ornithologists' Union 80 Bent, Arthur Cleveland, 1866-1954 74 Cornell University Laboratory of Ornithology 65 Lownes Science Collection (Brown University) 57 Academy of Natural Sciences of Philadelphia 55 National Wildlife Federation 52 De Gruyter 51 Peterson, Roger Tory, 1908-1996 50 ebrary, Inc 50 History of Science Collection (Brown University) 44 U.S. Fish and Wildlife Service 42 National Geographic Society (U.S.) 41 Baird, Spencer Fullerton, 1823-1887 39 Geological Society of America 37 Coues, Elliott, 1842-1899 36 Nuttall, Thomas, 1786-1859 36 United States National Museum 35 Rafinesque, C. S (Constantine Samuel), 1783-1840 33 Elliot, Daniel Giraud, 1835-1915 32 Gray, Asa, 1810-1888 32 Say, Thomas, 1787-1834 30 Jordan, David Starr, 1851-1931 29 Chapman, Frank M (Frank Michler), 1864-1945 28 LeConte, John L (John Lawrence), 1825-1883 28 Michaux, François André, 1770-1855 27 Sibley, David, 1961- 27 ver todos ...

English 7,060 French 92 Latin 60 German 56 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 ver todos ...

Identification 671 Guidebooks 456 Classification 451 Field guides 426 Pictorial works 411 Electronic books 213 Congresses 170 Conference papers and proceedings 144 Bibliography 130 History 105 Illustrated works 105 Terminology 76 Nomenclature 73 Dictionaries 72 Biography 69 Catalogs 58 Catalogs and collections 57 Bibliographies 55 Biographies 53 Juvenile literature 52 Academic theses 34 Identification guides 32 Juvenile works 32 Maps 31 Ouvrages illustrés 28 Handbooks, manuals, etc 27 Reference works 27 Guides d'identification 26 Handbooks and manuals 25 Thèses et écrits académiques 25 ver todos ...

1785-1851 65 Tertiary 63 Cretaceous 53 Cenozoic 52 Paleozoic 49 Pleistocene 45 Quaternary 36 Mesozoic 33 From 10 thousand to 2 million years ago 31 From 2 to 65 million years ago 31 Eocene 30 19th century 29 From 230 to 570 million years ago 26 Devonian 25 Ordovician 25 From 2 million years ago 24 From 65 to 140 million years ago 23 Jurassic 23 From 65 million years ago 21 Precambrian 19 Silurian 18 Triassic 17 From 65 to 230 million years ago 16 Carboniferous 15 Cambrian 13 From 345 to 405 million years ago 13 Paleocene 13 Miocene 12 Permian 12 From 570 million to 5 billion years ago 11 ver todos ...