Timko, Robert J. <br/><br/>
Sulfur hexafluoride as a mine ventilation research tool :  recent field applications / 
by Robert J. Timko and Edward D. Thimons. 
 - [Avondale, Md.] :  U.S. Dept. of the Interior, Bureau of Mines,  1982. 
 - 15 p. :  ill. ;  28 cm. 
 - Report of investigations / United States Department of the Interior, Bureau of Mines ;  8735 .
 - Report of investigations (United States. Bureau of Mines) ;  8735. .
<br/><br/>Bibliography: p. 15. 
<br/><br/><label>LCCN: </label>82600287  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine ventilation.<br/>Sulfur hexafluoride.<br/>Tracers (Chemistry)
<br/><br/><label>LC Class. No.: </label>TN23  TN301  / .U43 no. 8735 
<br/><br/><label>Dewey Class. No.: </label>622 s  622/.42 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 28.23: