Thimons, Edward D. <br/><br/>
Using sulfur hexafluoride as a gaseous tracer to study ventilation systems in mines  
Thimons, Edward D.; Bielicki, Richard J.; Kissell, Fred N. 
 - Washington  Bureau of mines  1974 
 - 22 p. 
 - RI 7916 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>MINING
<br/><br/><label>Subjects--Index Terms: </label>VENTILACION EN LAS MINAS HEXAFLUORURO DE AZUFRE VENTILATION SYSTEMS IN MINES SULFUR HEXAFLUORIDE 
<br/><br/><label>Universal Decimal Class. No.: </label>622