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Google Analytics Dashboard for Oil and gas resource assessment areas, U. S. Geological Survey, Geologic Division, 1980; Lower 48 states, regions 2 through 11, and 2A, 6A, and 11A
Oil and gas resource assessment areas, U. S. Geological Survey, Geologic Division, 1980; Lower 48 states, regions 2 through 11, and 2A, 6A, and 11A