Base compiled in 1976 from USGS 1:24 000 and 1:62 500-scale topographic maps dated 1922-1971, revised from aerial photographs taken 1974 and 1977; interpretations derived from soil map constructed 1974.; "Projection and 10 000-meter grid ticks, zone 16: Universal Transverse Mercator."; "25 000-foot grid ticks based on Illinois coordinate system, west zone."; May 1979.; Includes location map. 53 x 81 centimeters Scale 1:100,000
Creator:
United States. Soil Conservation Service
Publisher:
Dept. of Agriculture, Soil Conservation Service (Washington.)
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