Betterley, Melvin L. <br/><br/>
Sheet metal drafting 
Melvin L. Betterley. 
 - 2nd.ed. 
 - New York   Gregg Division, McGraw-Hill  c1978. 
 - vi, 314 p. :  ill.  24 cm. 
<br/><br/>Includes Indexs 
<br/><br/><label>ISBN: </label>0070051267 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanical Drawing<br/>Sheet-metal work--Patternmaking.