Gilman

Chicago citation style
Geological Survey (U.S. Gilman. 1973. Retrieved from the Digital Public Library of America, http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2342. (Accessed December 8, 2019.)
APA citation style
Geological Survey (U.S, (1973) Gilman. Retrieved from the Digital Public Library of America, http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2342
MLA citation style
Geological Survey (U.S. Retrieved from the Digital Public Library of America <http://content.wisconsinhistory.org/cdm/ref/collection/maps/id/2342>.
Note: These citations are programmatically generated and may be incomplete.