Jr. Of Recreational Mathematics 

 - New York  Grenwood Pesi. Inc.  1971 
 - 299 
 - Nos. 1-4 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Bm7311:N68
<br/><br/><label>Dewey Class. No.: </label>Bm7311:N68  / J8.4