Childcraft the how and why library  math magic 

 - London  World Book - Childcraft Int'l Inc.  1981 
 - 303 p. illus. photo 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations
<br/><br/><label>Dewey Class. No.: </label>R 510 W893c 1981 no.13