Willerding, Margaret F. <br/><br/>
Mathematics around the clock / 
Margaret F. Willerding. 
 - Chicago :   California state department of education,   c 1970. 
 - 96 p. :  ill. ;  2 cm. 
 - California state series. .
<br/><br/>92  92 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics.
<br/><br/><label>Dewey Class. No.: </label>372.7 / W668m