Underhill, Robert G. <br/><br/>
Diagnosing mathematical difficulties 
Robert G. Underhill, editor, A. Edward Uprichard, James W. Heddens 
 - Columbus, Ohio  Merrill  c1980 
 - ix, 392 p.  ill.  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Remedial teaching
<br/><br/><label>Dewey Class. No.: </label>372.7