Elementary mathematics :  patterns and structures / 
Eugene D. Nichols ...[et.al.]. 
 - New York:   Holt, Rinehart and Winston,   1968.  
 - v. :  ill. ;  24 cm. 
<br/><br/>Includes index and bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.7044