Durán Rodríguez, Raúl Coal zones of Colombia - Houston, Texas Circum-Pacific Council for Energy and Mineral Resources 1990 - pp. 139-150 maps., tbls. - Earth Science Series . Subjects--Topical Terms: CARBONGEOLOGIA DEL CARBONRESERVAS DE CARBON Subjects--Geographic Terms: COLOMBIA Universal Decimal Class. No.: 553.042(238.1)/E75|8