Application of large-hole burn cut in room-and-pillar mining / 
by R.L. Schnidt ...[et al.] 
 - [Washington] :  U.S. Dept. of the Interior, Bureau of Mines,  1975. 
 - 25 p. 
 - Report of investigations ;  7994 .
 - United States.  Bureau of Mines.  Report of investigations ;  7994 .
 - Report of investigations (United States. Bureau of Mines) ;  7994 .
<br/><br/><label>LCCN: </label>91055184 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Blasting.<br/>Mining engineering.