Barczak, Thomas M. <br/><br/>
Critical-load studies of a shield support / 
by Thomas M. Barczak and David E. Schwemmer. 
 - Pittsburgh, Pa. :  U.S. Dept. of the Interior, Bureau of Mines,  1987. 
 - 15 p. :  ill. ;  28 cm. 
 - Report of investigations ;  9141 .
 - Report of investigations (United States. Bureau of Mines) ;  9141. .
<br/><br/><label>LCCN: </label>87600280  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Longwall mining.<br/>Mine roof control.
<br/><br/><label>LC Class. No.: </label>TN23  TN275  / .U43 no. 9141 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.334 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:9141