Artifical satellites 

 -  1968 
<br/><br/><label>Standard No.: </label>307823 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MATHEMATICS
<br/><br/><label>Dewey Class. No.: </label>B9,98, 168K8