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- Arkansas Geological Survey1
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- Flint, Harold J.1
- Namibia. Ministry of Mines and Energy1
- Petroleum Economist Ltd1
- Rhodesia and Nyasaland. Federal Dept. of Trigonometrical and Topographical Surveys1
- United States. Office of Strategic Services. Research and Analysis Branch1
- United States. Western Area Power Administration. Billings Area Office1
- Zambia. Survey Dept1
