Surveyed in 1925.; Relief shown by contours, shading, and spot heights.; Shows roads, campgrounds, tunnel, waterholes, caves and other natural features.; In upper margin: "State of Idaho, Bureau of Mines and Geology."; "Datum is mean sea level."; "North American datum."; "5000 yard grid based upon U.S. zone system F."; "Contour interval 10 feet."; On verso: text and ill. 65 x 46 centimeters Scale 1:31,680 General Map Collection
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