Tracy, J.C. North, H.B <br/><br/>
Descriptive Geometry I & II 

 - J. Wiley  N.Y.  1914 
 - 126p.  Fig. 
<br/><br/><label>Nat. Bib. No.: </label>1499 
<br/><br/><label>Universal Decimal Class. No.: </label>515  / DES