U.S. Department of Agriculture, Forest Service ; compiled at Regional Office, Missoula, 1937 from aerial photographs, U.S.G.S., G.L.O., Forest Service and other surveys by J.F. Skidmore ; traced by J.F. Skidmore and D.A. Gregory.
Relief shown by hachures and spot heights.
"Boise and Willamette meridians."
Public land grid.