Abell, George O. <br/><br/>
Exploration of the universe /  
George O. Abell, David Morrison, Sidney C. Wolff.   
 - Philadelphia :   Saunders College Pub.,   c1991. 
 - xiv, 682 pages :   color illustrations ;   28 cm 
<br/><br/><label>ISBN: </label>0030345847 
<br/><br/><label>LC Class. No.: </label>QB45   / Ab3 1991