1. Geologic map of the Fredonia 30ʹ x 60ʹ quadrangle, Coconino and Mohave Counties, northern Arizona Author/Creator: Billingsley, George H. Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2008 Resource Type: Map Access & Availability: Loading
2. Geologic map of the Cameron 30ʹ x 60ʹ quadrangle, Coconino County, northern Arizona Author/Creator: Billingsley, George H. Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2007 Resource Type: Map Access & Availability: Loading
3. Geologic map of the Peach Springs 30ʹ x 60ʹ quadrangle, Mohave and Coconino Counties, northwestern Arizona Author/Creator: Billingsley, George H. Publication/Creation: Flagstaff, Ariz. : U.S. Dept. of the Interior, U.S. Geological Survey, 2006 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
4. Geologic map of the Valle 30ʹ x 60ʹ quadrangle, Coconino County, northern Arizona Author/Creator: Billingsley, George H. Publication/Creation: Flagstaff, Ariz. : U.S. Dept. of the Interior, U.S. Geological Survey, 2006 Resource Type: Map Edition: Version 1.0. Access & Availability: Loading
5. Geologic map of Pipe Spring National Monument and the western Kaibab-Paiute Indian Reservation, Mohave County, Arizona Author/Creator: Billingsley, George H. Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2004 Resource Type: Map Access & Availability: Loading