http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
U.S. Department of Agriculture, Forest Service ; compiled at Regional Office, Portland, from U.S.G.S., Bu. of Land Management (formerly G.L.O.) Forest Service, and other surveys, 1934. Revised Sept. 1946.
Relief shown by hachures and spot heights.