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  1. Oklahoma Geological Quadrangles (OGQs) - The University of Oklahoma

  2. Geologic map of Oklahoma | U.S. Geological Survey - USGS.gov

  3. Maps - The University of Oklahoma

  4. USGS Mineral Resources On-Line Spatial Data

  5. Geologic Maps (GMs) - The University of Oklahoma

  6. National Geologic Map Database - USGS

  7. A DIGITAL GEOLOGIC MAP DATABASE FOR THE STATE OF OKLAHOMA