1. Map showing outcrops of pre-quaternary ash-flow tuffs and volcaniclastic rocks, basin and range province, Northern California Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Resource Type: Map Access & Availability: Loading
2. Map showing outcrops of pre-quaternary basaltic rocks, basin and range province, Oregon Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: Denver, Colorado : Open-File Services Section, Western Distribution Branch, U.S. Geological Survey Resource Type: Map Access & Availability: Loading
3. Map showing outcrops of pre-Quaternary ash-flow tuffs and volcaniclastic rocks, basin and range province, Arizona Author/Creator: Geological Survey (U.S.), cartographer Publication/Creation: [Reston, Va.] : Department of the Interior, United States Geological Survey, 1984 Resource Type: Map Access & Availability: Loading