Geometry : an investigative approach 
O'Daffer, Phares G. 
 - Second edition. 
 -  Addison-Wesley Publishing Company.  1992 
 - xv, 456 pages. 
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<br/><br/><label>ISBN: </label>0-201-21795-3 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry.
<br/><br/><label>Dewey Class. No.: </label>516 O42g 1992