1. Quaternary geologic map of the Blue Ridge 4° x 6° quadrangle, United States Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, Va. : U.S. Geological Survey ; Denver, CO : For sale by Map Distribution, 1991 Resource Type: Map Access & Availability: Loading
2. Sapping features of the Colorado Plateau : a comparative planetary geology field guide Publication/Creation: Washington, DC : Scientific and Technical Information Division, National Aeronautics and Space Administration, 1988 Resource Type: Book Access & Availability: Loading