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1.- COALIFICATION OF ORGANIC MATTER IN A COAL BALL FROM THE CALHOUN COAL BED (UPPER PENNSYLVANIAN), ILLINOIS BASIN, UNITED STATES OF AMERICA;
 MADRID, 1985
CONGRES INTERNATIONAL DE STRATIGRAPHIE ET DE GEOLOGIE DU CARBONIFERE. 10/1983-09-12/MADRID
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2.- COALIFICATION OF ORGANIC MATTER IN COAL BALLS FROM THE ILLINOIS BASIN, UNITED STATES;
MADRID, 1983
CONGRESO INTERNACIONAL DE ESTRATIGRAFIA Y GEOLOGIA DEL CARBONIFERO. 10. ABSTRACTS/1983/MADRID
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