1921. 1 3/4 in. to the mile Material in the public domain. No restrictions on use. University of Iowa. Libraries. Map Collection. Anderson Publishing Company.
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1930. W.W. Hixson & Co.'s 1930 plat book of Audubon County, Iowa, containing a map of the county and township maps showing land ownership 1 atlas: 14 l.;... W.W. Hixson & Co.
1900. Geo. A. Ogle & Company. 2 in. to the mile Material in the public domain. No restrictions on use. University of Iowa. Libraries. Map Collection. Geo. A. Ogle & Co.