11. Geology of Grand Canyon, northern Arizona (with Colorado River guides) : Lees Ferry to Pierce Ferry, Arizona Publication/Creation: Washington, D.C : American Geophysical Union, [1989] Resource Type: Book Access & Availability: Loading
12. The potential of breccia pipes in the National Tank Area, Hualapai Indian Reservation, Arizona Author/Creator: Wenrich, Karen J., author Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1989 Resource Type: Book Access & Availability: Loading