Book 511 Government Document 468 Conference Proceeding 12 Electronic 12 Serial 1

Geological Survey (U.S.) 49 U.S. Fish and Wildlife Service 25 National Institute of Standards and Technology (U.S.) 24 United States National Aeronautics and Space Administration 16 United States National Park Service 16 National Science Foundation (U.S.) 14 United States Congress. Office of Technology Assessment 14 National Climatic Data Center (U.S.) Research Customer Service Group 11 Smithsonian Institution Press 11 Lott, Neal 9 U.S. Fish and Wildlife Service Region 1 8 United States Department of the Interior 8 National Assessment of Educational Progress (Project) 7 Rocky Mountain Research Station (Fort Collins, Colo.) 7 United States National Oceanic and Atmospheric Administration 7 Goddard Space Flight Center 6 National Center for Education Statistics 6 United States Forest Health Technology Enterprise Team 5 United States Minerals Management Service. Gulf of Mexico OCS Region 5 United States National Aeronautics and Space Administration. Scientific and Technical Information Office 5 Ames Research Center 4 Building and Fire Research Laboratory (U.S.) 4 Cooper, G. Arthur (Gustav Arthur), 1902-2000 4 Coral Reef Conservation Program (U.S.) 4 Educational Testing Service 4 Jet Propulsion Laboratory (U.S.) 4 National Institute of Education (U.S.) 4 Olson, Storrs L 4 Ross, Tom 4 Smithsonian Institution 4 see all ...

English 516 Russian 2 French 1 Italian 1 Japanese 1 Spanish 1

Eocene 5 From 40 to 55 million years ago 5 Tertiary 5 Pleistocene 4 Cretaceous 3 From 2 to 65 million years ago 3 From 65 to 140 million years ago 3 Jurassic 3 Miocene 3 Oligocene 3 Quaternary 3 1912 2 Cenozoic 2 Devonian 2 From 10 thousand to 2 million years ago 2 From 10 to 40 million years ago 2 From 140 to 190 million years ago 2 From 2 million years ago 2 From 570 million to 5 billion years ago 2 From 65 million years ago 2 Holocene 2 Pennsylvanian 2 Permian 2 Pliocene 2 Precambrian 2 Triassic 2 1887-1986 1 1980 1 1989 1 1995 1 see all ...