Levens, A. S.  1900-. <br/><br/>
Problems in mechanical drawing :  second course / 
A. S. Levens and A. E. Edstrom.  
 - 3rd ed. 
 - New York :  McGraw-Hill,  c1967. 
 - various pages :  ill. ;  28 cm. 
<br/><br/>
<br/><br/><br/>english 
<br/><br/><label>LCCN: </label>57009426  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mechanical drawing.
<br/><br/><label>LC Class. No.: </label>T353  / .L633 1957 
<br/><br/><label>Dewey Class. No.: </label>604.2/LEP