1964. Lewis, Samuel, 1753 or 1754-1822. Lewis and Clark Expedition (1804-1806)--Maps. [Bradford and Inskeep], Iowa City, State Historical Society of Iowa.
1999. United States Geological Survey (USGS). These data can be used in a geographic information system (GIS) for any number of purposes such as assessing wildlife habitat, water quality, pesti... State of Pennsylvania.
1966. Canadian Wildlife Service U.S. Fish and Wildlife Service U.S. Department of the Interior; now at USGS Patuxent Wildlife Research Center. The North American Breeding Bird Survey (BBS), which is coordinated by the Biological Resources Division and Canadian Wildlife Service, is a primar... State of Pennsylvania.