Preliminary evaluation of bit impact ignitions of methane using a drum-type cutting head / 
by David A. Larson ... [et al.]. 
 - [Avondale, Md.] :  U.S. Dept. of the Interior, Bureau of Mines,  1982. 
 - ii, 23 p. :  ill. ;  28 cm. 
 - Report of investigations ;  8755 .
 - Report of investigations (United States. Bureau of Mines) ;  8755. .
<br/><br/>Bibliography: p. 19-20. 
<br/><br/><label>LCCN: </label>82600321  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining--Safety measures.<br/>Coal-mining machinery--Safety measures.<br/>Methane--Combustion--Testing.
<br/><br/><label>LC Class. No.: </label>TN23  TN295  / .U43 no. 8755 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.8 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23:8755