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Oklahoma Geological Quadrangles (OGQs) - The University of Oklahoma
Geologic map of Oklahoma | U.S. Geological Survey - USGS.gov
Maps - The University of Oklahoma
USGS Mineral Resources On-Line Spatial Data
Geologic Maps (GMs) - The University of Oklahoma
National Geologic Map Database - USGS
A DIGITAL GEOLOGIC MAP DATABASE FOR THE STATE OF OKLAHOMA