The following websites are a mine of information for environmental historians

• American Society for Environmental History: http://www.aseh.net/
• H-Environment: http://www.h-net.org/~environ/
• Forest History Society: http://www.foresthistory.org/
• Environmental History Resources: http://www.eh-resources.org/
• Carolyn Merchant's Environmental History, Explore the Field: http://nature.berkeley.edu/departments/espm/env-hist/eh-internet.html
• Environmental History Virtual Library: http://vlib.iue.it/history/topical/environmental.html
• Environmental Protection Agency History: http://www.epa.gov/history/
• U.S. National Park Service History: http://www.nps.gov/history/
• U.S. Forest Service History: http://www.foresthistory.org/Research/usfscoll/index.html
• U.S. Fish & Wildlife Service History: https://nctc.fws.gov/history/index.html
• Library of Congress American Memory Site on Evolution of Early Conservation Movement: http://memory.loc.gov/ammem/amrvhtml/conshome.html
• Life and Legacy of Rachel Carson: http://www.rachelcarson.org
• Environmental History Timeline: https://environmentalhistory.org/
• Gaylord Nelson and Earth Day, A website on the making of the modern environmental movement: http://www.nelsonearthday.net/
• Environment & Society Portal: http://www.environmentandsociety.org/
• Center of the American West, University of Colorado: http://centerwest.org/
• American Society for Environmental History: http://www.aseh.net/
• Center for Culture, History, and Environment of the UW-Madison Gaylord Nelson Institute for Environmental Studies: http://envhist.wisc.edu
• Early Americas Digital Archive: http://eada.lib.umd.edu/
• National Geographic Society: http://www.nationalgeographic.com/