Hynek, Allen J. <br/><br/>
Challenge of the universe  a vistas of science book 
Allen J. Hynek and Norman.D. Anderson                                             
 - New York  McGraw-Hill  1962 
 - 143p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy<br/>Astronomy and Astrophysics Thesaurus<br/>Universe
<br/><br/><label>Universal Decimal Class. No.: </label>52  / HYN