Moebs, Noel N. <br/><br/>
Subsidence over four room-and-pillar sections in southwestern Pennsylvania / 
by Noel N. Moebs. 
 - [Washington, D.C.] :  U.S. Dept. of the Interior, Bureau of Mines,  1982. 
 - 23 p. :  ill. ;  28 cm. 
 - Report of investigations / United States Department of the Interior, Bureau of Mines ;  8645 .
 - Report of investigations (United States. Bureau of Mines) ;  8645. .
<br/><br/><label>LCCN: </label>81607835  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine subsidences--Measurement.--Pennsylvania<br/>Coal mines and mining--Safety measures.--Pennsylvania
<br/><br/><label>LC Class. No.: </label>TN23  TN319  / .U43 no. 8645 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.8 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:8645