Barczak, Thomas M. <br/><br/>
Examination of design and operation practices for longwall shields / 
by Thomas M. Barczak. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  1992. 
 - 14 p. :  ill. ;  28 cm. 
 - Information circular ;  9320 .
 - Information circular (United States. Bureau of Mines) ;  9320. .
<br/><br/>Includes bibliographical references (p. 14). 
<br/><br/><label>LCCN: </label>92008898  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine roof control.<br/>Longwall mining.
<br/><br/><label>LC Class. No.: </label>TN295  TN288  / .U4 no. 9320 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.28 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.27:9320