Base compiled in 1976 from USGS 1:24 000-scale topographic maps dated 1953-1973, revised from aerial photographs taken 1975; 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, east zone."; May 1980.; Includes location map.
32 x 44 centimeters
Scale 1:100,000