Mathematics for the elementary school :  book K : teacher's commentary / 
School Mathematics Study Group. 
 - [s.l.]:   School Mathematics Study Group,   1966.  
 - 109 p. ;  25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.7