1920. Hudson Map Company. Cartographic Details: Scale approximately 1:21,250. Scale incorrectly stated at 1/6000. Includes index. At lower right: C.L.H. & H.D.G., Del.. In l... Hudson Co., (Minneapolis).
1968. Paul Jacobs, Rebecca Barney, Len Kne, Ya Tao, and Dan Milz. A digitized version of Ian McHarg's original 1968 Ecological Study for the Twin Cities Metropolitan Area: Composite Intrinsic Suitability. These ma... University of Minnesota Digital Conservancy.
1880. Sanborn Map Company. Digital Sanborn® Maps (1867-1970) delivers detailed property and land-use records that depict the grid of everyday life in more than 12,000 U.S. to... ProQuest Information and Learning Company.