The Encyclopedia of Practical Engineering And Allied Trades  

 - Virtue & Co.  London   1930 
 - 240p.   Fig. 
 - Volume   X .
<br/><br/><label>Nat. Bib. No.: </label>2179 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer science, knowledge & systems 
<br/><br/><label>Universal Decimal Class. No.: </label>03.62  / VIR