Bergaust, Erik. <br/><br/>
Colonizing space / 
Erik Bergaust. 
 - New York :  Putnam,  1978. 
 - 62 p. :  ill. 
<br/><br/><label>ISBN: </label>0399611134 (lib. bdg.) :  $4.96 
<br/><br/><label>LCCN: </label>77011147 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Space colonies.
<br/><br/><label>Dewey Class. No.: </label>629.44