Bauer, Eric R. <br/><br/>
Longwall gate road roof instability and methods of control in the lower Kittanning Coalbed of Central Pennsylvania/ 
by E.R. Bauer, J.M. Listak, and E.D. Krupa. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  1992. 
 - 20 p. :  ill., maps ;  28 cm. 
 - Information circular ;  9331 .
 - Information circular (United States. Bureau of Mines) ;  9331. .
<br/><br/>Includes bibliographical references (p. 16-17). 
<br/><br/><label>LCCN: </label>92014755  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine roof control--Testing.<br/>Longwall mining--Pennsylvania--Cambria County.<br/>Gate roads (Mining)--Pennsylvania--Cambria County.
<br/><br/><label>LC Class. No.: </label>TN295  TN288  / .U4 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.334