Base source: USGS 1:100,000 county base map dated 1976; interpretations derived from soil map constructed 1977.; "Projection and 10,000-meter grid ticks, zone 17 and 16: Universal Transverse Mercator. 25,000-foot grid ticks based on Michigan coordinate system, south zone."; Oct. 1979.; "5,R-37,651."; Includes location map. 91 x 114 centimeters Scale 1:50,000