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
Creator
United States. Soil Conservation Service
Publisher
Dept. of Agriculture, Soil Conservation Service (Washington.)
Subject
Agriculture
Date Issued
1979
Rights
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United States. Soil Conservation Service (1979). Rock Island Co., Ill. Dept. of Agriculture, Soil Conservation Service (Washington.). https://umedia.lib.umn.edu/item/p16022coll624:484 (map)