O'Neill, Gerard K. <br/><br/>
The High Frontier :  Human Colonies in Space / 
Gerard K. O'Neill. 
 - New York :  William Morrow and Co., Inc.,  1977. 
 - 288 p. :  ill. 
<br/><br/> includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0-688-03133-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Space colonies