Simpson, R. E.  1920- <br/><br/>
Inorganic cement for mine roof-bolt grouting / 
by R. E. Simpson, J. E. Fraley, and D. J. Cox. 
 - Washington, D.C. :  U.S. Dept. of the Interior, Bureau of Mines,  1980. 
 - ii, 32 p. :  ill. ;  27 cm. 
 - Report of investigations ;  8494 .
 - Report of Investigations (United States. Bureau of Mines) ;  8494. .
<br/><br/>Bibliography: p. 29. 
<br/><br/><label>LCCN: </label>80607899  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine roof bolting.<br/>Grouting.<br/>Portland cement--Testing.<br/>Gypsum--Testing.
<br/><br/><label>LC Class. No.: </label>TN23  TN289.3  / .U43 no. 8494 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.28 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:8494