Base source: USGS 1:100,000 county base map compiled in 1975; interpretations derived from soil map constructed 1964.; "Projection and 10,000-metre grid ticks, zone 14: Universal Transverse Mercator. 25,000-foot grid ticks based on North Dakota coordinate system, south zone."; Feb. 1977.; Includes location map. 51 x 66 centimeters Scale 1:100,000; 1 cm. = 1 kilometer