Library Web Catalogs
Alaska Resources Library and Information Services (ARLIS)
Bureau of Land Management Library
Bureau of Reclamation Service Center Library
ConserveOnline (The Nature Conservancy)
Denver
Public Library
(Western History Collection:papers of Olaus Murie, John Muir, Howard Zahniser, Rosalee Edge to name a few)
National Agricultural Library (AGRICOLA)
National Park Service (NPS) Combined Library Catalog
Office of Surface Mining Library
Smithsonian Institution Libraries
U.S. Army Corps of Engineers Library
U.S. Department of the Interior Library
U.S. Fish and Wildlife Service
U.S. Geological Survey Library
U.S. Geological Survey - Biological Resources Division - Libraries
University Catalogs (Z3950 Gateway via Library of Congress)
University of Wisconsin Archives: Aldo Leopold's stomping grounds
Upper Mississippi River Conservation Committee Library