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1.- COAL RESOURCES OF THE BAJA TALAMANCA AREA OF COSTA RICA
CIRCUM-PACIFIC COUNCIL FOR ENERGY AND MINERAL RESOURCES; HOUSTON, TX; USA; UNITED STATES, 1995
ENERGY AND MINERAL POTENTIAL OF THE CENTRAL AMERICAN-CARIBBEAN REGION
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2.- EXPLORATION, DEVELOPMENT, AND UTILIZATION OF COAL IN COSTA RICA
CIRCUM-PACIFIC COUNCIL FOR ENERGY AND MINERAL RESOURCES; HOUSTON, TX; USA; UNITED STATES, 1995
ENERGY AND MINERAL POTENTIAL OF THE CENTRAL AMERICAN-CARIBBEAN REGION
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