Helsel, Jay D <br/><br/>
Mechanical drawing 

 - 9th. ed. 
 - New York  MacGraw-Hill  1980 
 - 568p. : ill 
<br/><br/><label>ISBN: </label>0070223130 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MECHANICAL DRAWING<br/>DESIGN
<br/><br/><label>LC Class. No.: </label>T 353 Mec