1. Nomenclature of Precambrian rocks in Colorado Author/Creator: Tweto, Ogden, 1912-1983 Publication/Creation: Washington : U.S. Govt. Print. Off., 1977 Format: Book Is Part Of: U.S. Geological Survey bulletin, no. 1422-1425. Access & Availability: Loading
2. Nomenclature of Precambrian rocks in Colorado Author/Creator: Tweto, Ogden, 1912-1983, author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1977 Format: Book Access & Availability: Loading