Coal-mine ventilation, 

 - Revised ed. 
 - [Washington,  U.S. Govt. print. off.,  1931]. 
 - xi, 92 p.  illus.  23 cm. 
<br/><br/><label>LCCN: </label>e  31000714  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine ventilation.
<br/><br/><label>LC Class. No.: </label>LC1045  / .A25 no. 41b