Koff, Richard M. <br/><br/>
How does it work? / 
by Richard M. Koff. 
 - Garden City, N.Y. :  Doubleday,  1961. 
 - 288 p. :  ill. 
<br/><br/><label>LCCN: </label>61007761  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machinery.<br/>Implements, utensils, etc.<br/>Tools.<br/>Electric apparatus and appliances.