1. Geologic map of the pre-Tertiary rocks in the eastern Aldrich Mountains and adjacent areas to the south, Grant County, Oregon [cartographic material] Yale Public content 1977. 2013-11-15T16:25:41Z. 2013-11-18T19:18:55Z. Brown, C. Ervin (Clarence Ervin), 1925-. The Survey. English. Public. Oregon, Grant County, Aldrich Mountains, and U.S.