Smith, W. C.  1955- <br/><br/>
Roof control strategies for underground coal mines / 
by William C. Smith. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  1993. 
 - 17 p. :  ill. ;  28 cm. 
 - Information circular ;  9351 .
 - Information circular (United States. Bureau of Mines) ;  9351. .
<br/><br/>Includes bibliographical references (p.16-17). 
<br/><br/><label>LCCN: </label>93002742  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine roof bolting.<br/>Mine roof control.<br/>Coal mines and mining.
<br/><br/><label>LC Class. No.: </label>TN295  TN289.3  / .U4 no. 9351 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.334