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Report on an occurrence of manganese ore at Saxacalli, lower Essequibo River

by Bishopp, Douglas Wallace, 1900-
Physical details: 4 leaves : maps. Subject(s): 1. Geology - British Guiana. | 2. Manganese ores - British Guiana.
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At head of title : Geological survey of British Guiana.

c/c 109807

c/c 109808

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