

Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
MARSH, J. M.
MARSH, J. M. (Seneca Co., NT--Dubuque, IA, Jan. 16, 1858). Surveyor. Marsh surveyed a large portion of Michigan, Wisconsin and Iowa and settled in Dubuque in 1840. He was a U.S. Deputy Surveyor and established the state line between Iowa and Minnesota.
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Source:
Oldt, Franklin T. The History of Dubuque County