Silverberg, Robert. <br/><br/>
Forgotten by time / 
Robert Silverberg. 
 - New York :  Thomas Y. Crowell Company,  c1966. 
 - 215 pages :  Illustrations ;  21 cm. 
<br/><br/>Bibliography: p. 204-207. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Living fossils--Juvenile literature.
<br/><br/><label>LC Class. No.: </label>QH371  / .S5 
<br/><br/><label>Dewey Class. No.: </label>575