Book 5,381 Government Document 4,851 Serial 117 Conference Proceeding 109 Electronic 108 Map 49 Journal 13 Photo 6 Reference Material 4 Book Chapter 2 Thesis 1 Unknown 1 see all ...

Geological Survey (U.S.) 3,433 U.S. Fish and Wildlife Service 356 United States National Park Service 165 United States Bureau of Mines 137 United States Bureau of Land Management 105 Western Energy and Land Use Team 71 National Wetlands Research Center (U.S.) 69 United States Minerals Management Service. Gulf of Mexico OCS Region 67 Biological Services Program (U.S.) 65 National Coastal Ecosystems Team (U.S.) 60 United States Department of the Interior 45 United States National Biological Service 43 United States Bureau of Reclamation 39 U.S. Fish and Wildlife Service Region 8. Research and Development 36 Eisler, Ronald, 1932- 32 U.S. Fish and Wildlife Service Office of Biological Services 32 United States Department of Energy 31 U.S. Army Engineer Waterways Experiment Station Coastal Ecology Group 29 United States Minerals Management Service. Alaska OCS Region 28 National Science Foundation (U.S.) 26 Du Bray, E. A 24 National Wetlands Inventory (U.S.) 24 U.S. Fish and Wildlife Research and Development 23 United States Environmental Protection Agency 23 U.S. Fish and Wildlife 22 United States National Oceanic and Atmospheric Administration 22 U.S. Fish and Wildlife Service Region 1 21 Diggles, M. F 20 National Ecology Center (U.S. Fish and Wildlife Service) 20 National Water-Quality Assessment Program (U.S.) 20 see all ...

English 5,563 Russian 17 Spanish 6 Polish 5 German 1 Japanese 1

Congresses 137 Maps 116 Bibliography 105 Periodicals 90 Conference papers and proceedings 71 Government publications 65 CD-ROMs 59 Statistics 57 Technical reports 40 Databases 36 Handbooks, manuals, etc 30 Nomenclature 26 Bibliographies 24 Rapports techniques 24 technical reports 24 Guidebooks 23 Handbooks and manuals 20 Classification 19 Tables 18 Internet resource 16 Directories 14 Academic theses 13 History 13 Observations 12 Pictorial works 12 Abstracts 11 Electronic government information 9 Field guides 9 Software 9 Dictionaries 8 see all ...

Cretaceous 119 Tertiary 74 Eocene 45 Precambrian 44 Paleozoic 43 Miocene 42 Cenozoic 38 Quaternary 37 Devonian 33 Mississippian 26 Pennsylvanian 26 Proterozoic 26 Triassic 26 Mesozoic 25 Pleistocene 25 Jurassic 24 Permian 24 Ordovician 23 Pliocene 23 From 65 to 140 million years ago 22 Oligocene 20 Silurian 18 Holocene 15 Cambrian 12 Archaean 10 From 40 to 55 million years ago 10 From 2 to 65 million years ago 9 From 570 million to 2 billion years ago 9 Carboniferous 8 From 2 million years ago 8 see all ...

United States 833 California 415 Alaska 284 Colorado 227 Nevada 178 Arizona 137 Montana 135 Utah 135 New Mexico 134 Oregon 123 Wyoming 122 Washington (State) 121 Florida 96 Idaho 86 North America 83 West (U.S.) 83 Texas 77 Mexico, Gulf of 75 Hawaii 63 Michigan 57 Virginia 47 Wisconsin 43 New York (State) 42 Pennsylvania 41 Pacific Ocean 40 Minnesota 37 Yellowstone National Park 37 Massachusetts 36 North Carolina 35 Missouri 34 see all ...