Base source: USGS 1:100,000 county base map compiled in 1975; interpretations derived from soil map constructed 1974.; "Projection and 10,000-metre grid ticks, zone 15: Universal Transverse Mercator."; "25,000-foot grid ticks based in Illinois coordinate system, west zone."; June 1977.; Includes location map. 92 x 122 centimeters Scale 1:50,000
Creator:
United States. Soil Conservation Service
Publisher:
Dept. of Agriculture, Soil Conservation Service (Washington.)
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