How things work:   The universal encyclopedia of machines 

 - London:   Granada Publishing Limited,   1972 
 - 590p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machine
<br/><br/><label>Subjects--Index Terms: </label>Work 
<br/><br/><label>Universal Decimal Class. No.: </label>R 621-1/-9(03)  / K7