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1.- INFLUENCE OF TECTONICS ON COAL QUALITY AND COAL RESOURCES IN THE APPALACHIAN BASIN;
 MADRID, 1983
CONGRESO INTERNACIONAL DE ESTRATIGRAFIA Y GEOLOGIA DEL CARBONIFERO. 10. ABSTRACTS/1983/MADRID
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2.- STRUCTURAL CONTROLS ON ENVIRONMENTS OF DEPOSITION, COAL QUALITY, AND RESOURCES IN THE APPALACHIAN BASIN IN KENTUCKY;
MADRID, 1985
CONGRES INTERNATIONAL DE STRATIGRAPHIE ET DE GEOLOGIE DU CARBONIFERE. 10/1983-09-12/MADRID
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