Perry, Edward L., 1939-  Perry, Edward L., 1939- <br/><br/>
Understanding elementary school mathematics 
[by] E. L. Perry, Jr. 
 - Menlo Park, Calif.,  Cummings Pub. Co.  [1973] 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>LCCN: </label>72094409 //r73 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics -- Study and teaching (Elementary)--Mathematics -- Study and teaching (Elementary)
<br/><br/><label>LC Class. No.: </label>QA135.5  / .P39 
<br/><br/><label>Dewey Class. No.: </label>512/.1