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1.- GEOLOGY AND MINERAL RESOURCE ASSESSMENT OF THE VENEZUELAN GUAYANA SHIELD AT 1:500,00 SCALE; A DIGITAL REPRESENTATION OF MAPS PUBLISHED BY THE U.S. GEOLOGICAL SURVEY
U. S. GEOLOGICAL SURVEY; RESTON, VA; USA; UNITED STATES, 1997
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2.- GEOLOGY AND RESOURCE ASSESSMENT OF COSTA RICA AT 1:500,000 SCALE; A DIGITAL REPRESENTATION OF MAPS OF THE U.S. GEOLOGICAL SURVEY'S 1987 FOLIO I-1865
U. S. GEOLOGICAL SURVEY; RESTON, VA; USA; UNITED STATES, 1996
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