Bauer, Eric R. <br/><br/>
Influence of subjacent gob on longwall development mining in the Upper Kittanning Coalbed of south-central Pennsylvania / 
by E.R. Bauer, G.J. Chekan, and G.P. Sames. 
 - Washington, D.C. :  Bureau of Mines, U.S. Dept. of the Interior,  1992. 
 - 13 p. :  ill. ;  27 cm. 
 - Report of investigations ;  9403 .
 - Report of investigations (United States. Bureau of Mines ;  9403. .
<br/><br/>Includes bibliographical references (p. 13). 
<br/><br/><label>LCCN: </label>91043726  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ground control (Mining)--Pennsylvania--Ebensburg Region.<br/>Longwall mining--Pennsylvania--Ebensburg Region.<br/>Coal mine waste--Pennsylvania--Ebensburg Region.
<br/><br/><label>LC Class. No.: </label>TN23  TN288  / .U43 no. 9403 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.334 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.22:9403