"Field of wildflowers" by Intermountain Forest Service, USDA Region 4 Photography , public domain
US Topo 7.5-minute
MT,ID Madison Arm 2020
US Topo 7.5-minute map of Madison Arm Quadrangle in Montana and Idaho. Published by the U.S. Geological Survey (USGS).
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U.S. Geological Survey (USGS), May 2020