TY - GEN AU - Chamberlain,C.Edward AU - Freedman,Robert W. ED - United States. TI - Microdetermination of volatile matter and rock dust conventration of airborne coal mine dust T2 - Report of investigations PY - 1974///] CY - [Washington] PB - U.S. Dept. of the Interior, Bureau of Mines KW - Mine dusts KW - Mine fires ER -