Betterley, Melvin L. <br/><br/>
Sheet metal drafting / 
Melvin L. Betterley. 
 - 2nd ed. 
 - McGraw-Hill, New York :  Gregg Division,  1978. 
 - vi, 314 p. :  ill. ;  24 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0070051267 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sheet--metal work--Pattern--Making.<br/>Mechanical drawing.