1. Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise Counties, southeastern Arizona Author/Creator: Marvin, Richard F., author Publication/Creation: [Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973 Resource Type: Book Access & Availability: Loading
2. Radiometric ages of igneous rocks from Pima, Santa Cruz, and Cochise Counties, southeastern Arizona Publication/Creation: Washington : U.S. Govt. Print. Off, 1973 Resource Type: Book Is Part Of: U.S. Geological Survey bulletin, no. 1373-1381. Access & Availability: Loading