Reports

Klett, T.R., Ahlbrandt, T.S., Schmoker, J.W. & Dolton, G.L., 1997. Ranking of the World's Oil and Gas Provinces by Known Petroleum Volumes. Open-File Report 97-463. ≡

Documents

Persits, F.M., Ahlbrandt, T.S., Tuttle, M.L., Charpentier, R.R., Brownfield, M.E. & Takahashi, K.I. (comps.), 1997. Maps showing geology, oil and gas fields and geological provinces of Africa. U.S. Geological Survey Open-File Report 97-470-A. ≡