Selected geologic factors affecting mining of the Pittsburgh coalbed / 
by C.M. McCulloch ...[et al.] 
 - [Washington] :  U.S. Dept. of the Interior, Bureau of Mines,  [1975]. 
 - 72 p. :  ill. (some col.), maps. 
 - Report of investigations ;  8093 .
 - United States.  Bureau of Mines.  Report of investigations ;  8093 .
 - Report of investigations (United States. Bureau of Mines) ;  8093 .
<br/><br/><label>LCCN: </label>91055142 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining--Pennsylvania.<br/>Coal mines and mining--West Virginia.