Tuttle, M. L., Geological Survey (U.S.). (1997). U.S. Geological Survey studies of energy resources in Sub-Saharan Africa. Denver, Colo.: U.S. Geological Survey.MLA Citation
Tuttle, M. L, and Geological Survey (U.S.). U.S. Geological Survey Studies of Energy Resources In Sub-Saharan Africa. Denver, Colo.: U.S. Geological Survey, 1997.
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