Underhill, Robert G. <br/><br/>
Diagnosing mathematical difficulties / 
Robert G. Underhill, editor, A. Edward Uprichard, James W. Heddens 
 - Columbus, Ohio :  Merrill,  1980 
 - ix, 392 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0675081955 
<br/><br/><label>LCCN: </label>79-90124 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Remedial teaching