Walker, Jeffrey S. <br/><br/>
State-of-the-art techniques for backfilling abandoned mine voids / 
by Jeffrey S. Walker. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  [1993] 
 - 17 p. :  ill. ;  29 cm. 
 - Information circular ;  9359 .
 - Information circular (United States. Bureau of Mines) ;  9359. .
<br/><br/>Includes bibliographical references (p. 17). 
<br/><br/><label>LCCN: </label>91041440  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine filling.<br/>Abandoned coal mines.<br/>Mine subsidences.
<br/><br/><label>LC Class. No.: </label>TN295  TN292  / .U4 no. 9359 
<br/><br/><label>Dewey Class. No.: </label>622 s  622