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United States Environmental Protection Agency. Office of Research and Development 207 U.S. Fish and Wildlife Service 190 Geological Survey (U.S.) 148 National Wetlands Research Center (U.S.) 90 National Coastal Ecosystems Team (U.S.) 79 United States National Park Service 79 United States Environmental Protection Agency. Office of Research and Monitoring 77 United States Bureau of Land Management 75 United States Environmental Protection Agency 74 United States National Oceanic and Atmospheric Administration 63 Western Energy and Land Use Team 57 U.S. Army Engineer Waterways Experiment Station Coastal Ecology Group 56 National Environmental Research Center (Corvallis, Or.) 52 Gap Analysis Program (U.S.) 51 United States Forest Service 50 United States General Accounting Office 50 Coastal Services Center (U.S.) 44 Corvallis Environmental Research Laboratory 40 United States Minerals Management Service. Gulf of Mexico OCS Region 36 Biological Services Program (U.S.) 35 Rocky Mountain Research Station (Fort Collins, Colo.) 33 Eisler, Ronald, 1932- 32 Geological Survey (U.S.) Biological Resources Division 32 Environmental Management Technical Center (U.S.) 31 North Carolina Natural Heritage Program 30 Environmental Research Laboratory (Duluth, Minn.) 29 United States Congress. Office of Technology Assessment 29 United States Department of the Interior 29 North Carolina Natural Heritage Trust Fund 27 National Ecology Center (U.S. Fish and Wildlife Service) 24 see all ...

English 3,706 French 23 Spanish 12 Russian 8 Japanese 2 Yupik 1

Congresses 231 Government publications 115 Conference papers and proceedings 114 Periodicals 92 Maps 64 Classification 54 Handbooks, manuals, etc 53 Bibliography 45 Handbooks and manuals 40 Technical reports 34 CD-ROMs 33 Directories 32 Internet resource 31 Databases 29 Bibliographies 22 Actes de congrès 21 Abstracts 20 Congress 20 Rapports techniques 20 technical reports 20 Electronic books 19 Guides et manuels 16 Academic theses 14 History 14 Biography 12 Observations 12 Dictionaries 11 Electronic government information 11 Statistics 11 Atlases 10 see all ...

1809-1882 4 1823-1902 2 1877-1968 2 (1877- ) 1 1683-1749 1 1707-1788 1 1798-1882 1 1811-1882 1 1840-1897 1 1842-1910 1 1849-1938 1 1858-1919 1 1860-1890 1 1866-1948 1 1877 1 1877- 1 1887-1986 1 1892-1978 1 1908-1993 1 1923- 1 1923-1992 1 1928-2005 1 1934- 1 20e siècle 1 Eocene 1 From 40 to 55 million years ago 1 Holocene 1 Miocene 1 Pleistocene 1 see all ...

United States 877 California 151 Florida 120 Alaska 81 Mexico, Gulf of 73 Arizona 68 Oregon 64 Idaho 59 Washington (State) 55 Colorado 53 North Carolina 52 New Mexico 50 Montana 49 Canada 47 Texas 47 North America 42 Atlantic Ocean 40 Atlantic Coast (U.S.) 35 West (U.S.) 34 Nevada 32 Wyoming 32 Minnesota 29 Wisconsin 28 Utah 25 Louisiana 24 Pacific Ocean 24 South Carolina 23 New York (State) 21 Gulf of Mexico 20 Nebraska 20 see all ...