Porterfield

Chicago citation style
Geological Survey (U.S. Porterfield. 1982. Retrieved from the Digital Public Library of America, http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2837. (Accessed March 28, 2024.)
APA citation style
Geological Survey (U.S, (1982) Porterfield. Retrieved from the Digital Public Library of America, http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2837
MLA citation style
Geological Survey (U.S. Retrieved from the Digital Public Library of America <http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2837>.
Note: These citations are programmatically generated and may be incomplete.