Hynek, Allen <br/><br/>
Challemge of the universe  : 

 - New York :   Scholastic Book Service,   1962. 
 - 143 páginas :   il., diagr., dib. 
 - National Science Teachers Association : Vistas of Science ;   4 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>SATELITE ARTIFICIAL<br/>INGENIERIA AEROESPACIAL