Asimov, Isaac,  1920- <br/><br/>
The double planet. 
Diagrs. by John Bradford. 
 - Rev. ed. 
 - London,  New York,  Abelard-Schuman  [1967, c1966] 
 - 159 p.  illus.  22 cm. 
<br/><br/><label>LCCN: </label>67001290 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Earth.<br/>Moon.
<br/><br/><label>LC Class. No.: </label>QB631  / .A75 1967 
<br/><br/><label>Dewey Class. No.: </label>525