Abell, George Ogden,  1927-1983. <br/><br/>
Exploration of the universe / 
George O. Abell, David Morrison, Sidney C. Wolff. 
 - 5th ed. 
 - Philadelphia :  Saunders College Publ.,  1987. 
 - x, 748, [7] p. :  [44] p. of plates : ill. (some col.) ;  26 cm. 
 - Saunders Golden Sunburst Series .
<br/><br/> Includes index. 
<br/><br/>Bibliogr.: p. 692-698. 
<br/><br/><label>ISBN: </label>0030051436 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Աստղագիտություն
<br/><br/><label>Dewey Class. No.: </label>520