Statesmen's Who's Who 2000 . East Grinstead, West Sussex, England, Bowker-Saur, 1999. London, Zed Books, 1999. London, Oxford University Press for the International Institute for Strategic Studies, 1999. 320 p. Liberia, p 266.
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International 1997 Africa and the Middle East Volume 3 . Washington, U.S. Dept of the Interior and U.S. Geological Survey, 1999. The Mineral Industry of Liberia by Philip M. Mobbs, p V1. Book call no. Washington, United States Dept of State, 2000.