http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Bureau of Topographic and Geologic Survey.
Commonwealth of Pennsylvania, Department of Environmental Resources, Office of Parks and Forestry, Bureau of Topographic and Geologic Survey.
"Copyright 1993 by Commonwealth of Pennsylvania."
Map (Pennsylvania. Bureau of Topographic and Geologic Survey) ; 10