Del Rey, Lester, 1915- <br/><br/>
The mysterious earth 
Lester Del Rey 
 - [1st ed.] 
 -  Chilton Co. , Book Division Philadelphia  1960  [1960] 
 - 214 p. ; 22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth<br/>Paleontology--QE
<br/><br/><label>LC Class. No.: </label>QE501.D4