Chekan, G. J. <br/><br/>
Strata interactions in multiple-seam mining--two case studies in Pennsylvania / 
by Gregory J. Chekan, Rudy J. Matetic, and James A. Galek. 
 - Pittsburgh, Pa. :  U.S. Dept. of the Interior, Bureau of Mines,  1986. 
 - ii, 17 p. :  ill. ;  28 cm. 
 - Report of investigations / United States Department of theInterior, Bureau of Mines ;  9056 .
 - Report of investigations (United States. Bureau of Mines) ;  9056. .
<br/><br/>Bibliography: p. 17. 
<br/><br/><label>LCCN: </label>86600221  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine subsidences--Pennsylvania.<br/>Ground control (Mining)<br/>Pillaring (Mining)<br/>Coal mines and mining--Pennsylvania.
<br/><br/><label>LC Class. No.: </label>TN23  TN319  / .U43 no. 9056 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.8 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:9056