Haddock, M.H. <br/><br/>
Mine ventilation and ventilators 

 - London  Charles Griffin and Company  1924 
 - 337 p.  ilus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>VENTILACION DE MINAS
<br/><br/><label>Universal Decimal Class. No.: </label>A/622.42/H13