Base compiled in 1976 from USGS 1:24,000-scale topographic maps dated 1965-68; planimetry revised from aerial photographs taken 1974.; "Projection and 10,000-meter grid ticks, zone 16: Universal Transverse Mercator ... 25 000-foot grid ticks based on Ohio coordinate system."; Includes location map. 80 x 86 centimeters Scale 1:50,000