Silverberg, Robert. <br/><br/>
Across a billion years/ 
Robert Silverberg. 
 - London :  Magnum Book,  1979. 
 - 249 p.;  18 cm. 
<br/><br/><label>ISBN: </label>04170315505 
<br/><br/><label>Subjects--Topical Terms: </label>--Fiction.
<br/><br/><label>LC Class. No.: </label>PZ7.S55