1. Experimental digital shaded-relief maps of Oregon Author/Creator: Geological Survey (U.S.) Publication/Creation: Reston, VA : U.S. Geological Survey, 1992 Resource Type: Map Access & Availability: Loading
2. Experimental engineering-geologic and environmental-geologic maps of the conterminous United States Author/Creator: Radbruch-Hall, Dorothy H., 1920- author Publication/Creation: [Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987 Resource Type: Book Access & Availability: Loading