1928. Geological Survey (U.S.). Surveyed in 1925.; Relief shown by contours, shading, and spot heights.; Shows roads, campgrounds, tunnel, waterholes, caves and other natural feat... U.S. Geological Survey (Washington, D.C).
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1928. Geological Survey (U.S.). Shows all forest reserves. Compiled in 1916, revised 1926. 159 x 103 centimeters Scale 1:500,000 General Map Collection. USGS (Washington, D.C.?).