Perry J <br/><br/>
Spinning tops 
Perry J 
 -  1929 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>45109 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B71:2, F9