Durell, Clement V <br/><br/>
Concise geometrical conics 

 -  Macmillan Co., London  1930 
 - 98 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Analytic geometry; Mathematics
<br/><br/><label>Dewey Class. No.: </label>516.3  DUR-C