Cochran, William,  1928- <br/><br/>
Mine subsidence extent and cost of control in a selected area / 
by William Cochran 
 - Washington :  U.S. Government Printing Office,  1971 
 - 32 p. :  ill. ;  26 cm. 
 - Information circular bureau of mines ;  8507 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subsidences (Earth movements)<br/>Mining engineering<br/>Coal mines and mining--Pennsylvania
<br/><br/><label>Dewey Class. No.: </label>622