Northcroft, L.G.  <br/><br/>
Steam trapping and air venting  (Book) 

 - 3rd ed. 
 - London  Hutchinson  1952 
 - 172 p.  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Steam-traps
<br/><br/><label>Universal Decimal Class. No.: </label>621.186.6 NOR  / 9751