Hay, Peter Stewart,  1884- <br/><br/>
A method of trapping the dust produced by pneumatic rock drills, 
by P.S. Hay. With a preface, by Professor J.S. Haldane ... 
 - London,  H.M. Stationery Off.,  1926. 
 - 18 p.  2 fold. pl., diagrs.  25 cm. 
 - [Gt. Brit.] Safety in Mines Research Board. Paper  no. 23 .
<br/><br/><label>LCCN: </label>gs 27000056  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mine safety.<br/>Rock-drills.
<br/><br/><label>LC Class. No.: </label>TN295  / .G65 no. 23