Ley, Willy <br/><br/>
The exploration of mars 
Willy Ley                                                
 - London  Sidwick and Jackson  1956 
 - 184p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Exploration - Mars<br/>Planet Mars
<br/><br/><label>Universal Decimal Class. No.: </label>523.43  / LEY