made from personal observations and information furnished by resident miners, prospectors, scouts and army guides by W.F. Anderson of Bonanza, Idaho, April 1880 ; drawn and compilation from U.S. land surveys; from scout map of headwaters of Salmon River, Lt. Geo. S. Wilson, 12th U.S. Infantry; from government map of Yellowstone National Park and other official data, by C.D. Gibbes, c.e., San Francisco, April 1880