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Cervik, Joseph

Rotary drilling holes in coalbeds for degasification Cervik, Joseph; Aul, George N.; Fields, H. H. - Washington Bureau of mines 1975 - 21 p. - RI 8097 .

Subjects--Topical Terms:
MINERIA
MINING

Subjects--Index Terms: SEGURIDAD MINERA DESGASIFICACION DE CARBON MINE SAFETY DEGASSING OF COAL

Universal Decimal Class. No.: 622