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Papers Presented Before The <br />H Fill <br />cen <br />SURFACE 41NING <br />VA 0710 <br />O SHJM <br />NCA/3Cf C,Qa1Conferenem and Expo 11/ <br />October 18.19-20 1977 <br />Kkfrizuf,:kyl'an and Expusnion Center <br />LouisvIlle. Kentucky <br />•poasored <br />NATIONAL COAL ASSOCIATION <br />BITUMINOUS COAL RESEARCH, I Nic <br />