1. Volcanic rocks of the El Modeno Area, Orange County, California Author/Creator: Yerkes, R. F., 1923- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1957 Resource Type: Book Access & Availability: Loading
2. Volcanic rocks of the El Modeno Area, Orange County, California Author/Creator: Yerkes, R. F., 1923- Publication/Creation: Washington : U.S. Govt. Print. Off, 1957 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 274. Access & Availability: Loading