Labels:text | map OCR: MAPS SHOWING GEOLOGY, OIL AND GAS FIELDS AND GEOLOGICAL PROVINCES OF AFRICA by by Feliks Persits, Thomas Ahlbrandt, Michele Tuttle, Ronald Charpentier, Michael Brownfield, and Kenneth Takahashi Open File Report 97-470A 1997 USGS U.S. Department of the Interior U.S. Geological Survey science for a changing world
