USGS Geologic Map: Grassy Lake Reservoir Quadrangle, Wyoming

Description: Surficial geologic map of the Grassy Lake Reservoir Quadrangle, Yellowstone National Park and Adjoining Area, Wyoming

Publisher: U.S. Geological Survey 

Map: I-644

Print Date: 1973

Scale: 1:62,500

Format: Folded

Media: One-sided paper map with color graphics.