USGS Geologic Map: Part of the Black Hills of South Dakota and Wyoming

Description: Bouguer Gravity, Aeromagnetic, and Generalized Geologic maps of Part of the Black Hills of South Dakota and Wyoming 

Publisher: U.S. Geological Survey 

Map: GP-903

Print Date: 1975

Scale: 1:250,000

Format: Folded

Media: One-sided paper map with color graphics.