"Field of wildflowers" by Intermountain Forest Service, USDA Region 4 Photography , public domain
US Topo 7.5-minute
WY Obsidian Cliff 2021
US Topo 7.5-minute map of Obsidian Cliff Quadrangle, Park County, Wyoming. Published by the U.S. Geological Survey (USGS).
|Yellowstone Pocket Maps|
U.S. Geological Survey (USGS), August 2021