Scale not given. Accompanied by Dept. of the Interior news release: Radar probes geologic past of Yellowstone National Park. Available also through the Library of Congress Web site as a raster image. AACR2
Available also through the Library of Congress Web site as a raster image. Depths shown by contours. Sectioned in 4, torn in half along vertical fold, and mounted on cloth. Includes notes and an Inset: Map showing areas of responsibility of committee members and associated contributors. In lower left margin: 989B.
American Association of Petroleum Geologists. Basement Rock Project Committee - Geological Survey (u.s.)