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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
- Original Format: Maps
- Date: 1967