1. Index map of the United states showing physiographic and distribution of quadrangles represented in the set of 100 selected maps Maps University Of Minnesota Public content 1921. Geological Survey (U.S.). Decorative vine border.; Map numbered 79.; Map detached from atlas.; Text on verso. 44 x 71 centimeters Scale 1:7,000,000 General Map Collection. The Survey (Washington, D.C).