Scale 1:500,000. 1 in. equals approximately 8 miles ; Lambert conformal conic projection, based on standard parallels 33° and 45° (W 95°46ʹ26ʺ--W 89°05ʹ55ʺ/N 40°36ʹ49ʺ--N 35°59ʹ44ʺ).
Also shows counties, towns, railroads, drainage, built-up areas, national and state parks, national and state forests, and national wildlife refuges. Relief shown by contours and spot heights. "Compiled in 1969." Includes "Source data" and "Population key."