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Bureau of Mines / Minerals yearbook mineral industries of Africa 1992
(1992)
Dolley, Thomas P.
Equatorial Guinea and Sao Tome E Principe, pp. 76-[79]
Page 76
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As a work of the United States government, this material is in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright




