Scale 1:1,000,000. 1 in. equals approximately 16 miles ; Lambert conformal conic projection based on standard parallels 33° and 45° (W 104°03ʹ--W 96°26ʹ/N 45°56ʹ--N 42°28ʹ).
Relief shown by spot heights., Shows counties, towns, and railroads, also shows the township and range grid., "Compiled in 1961.", and "Source data: U.S. Dept. of the Interior--Geological Survey topographic maps; U.S. Dept. of the Army--Corps of Engineers topographic maps."