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  • Map

    Radar mosaic, Yellowstone National Park, Wyoming.

    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

    • Contributor: Geological Survey (u.s.)
    • Date: 1968
  • Map

    Basement map of North America between latitudes 24° and 60° N

    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.

    • Contributor: American Association of Petroleum Geologists. Basement Rock Project Committee - Geological Survey (u.s.)
    • Date: 1967