The illustrated science and invention encyclopedia :  How it works / 

 - International edition 
 - 21 volumes :   illustrations (some color) ;   26 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technology --Encyclopedias.<br/>Science --Encyclopedias.<br/>Inventions
<br/><br/><label>Dewey Class. No.: </label>503