Impact of using auxiliary fans on coal mine ventilation efficiency and cost / 
by Keith G. Wallace, Jr. ... [et al.] 
 - [Washington] :  United States. Dept. of the interior, Bureau of Mines,  1990. 
 - 8 p. :  ill. 
 - Report of investigations ;  9307 .
 - Report of investigations (United States.  9307 .
<br/><br/><label>LCCN: </label>90001512  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine ventilation.<br/>Air flow   <br/>Fans (Machinery)<br/>Brattices (Mining)