Context

Context of Geologic map of the Venezuela part of the Puerto Ayacucho 20 x 30 quadrangle, Amazonas Federal Territory, Venezuela, U.S. Department of the Interior, U.S. Geological Survey ; prepared in cooperation with the Corporacion Venezolana de Guayana, Tecnica Minera, C.A. ; by Jeffrey C. Wynn ... [et al.]
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