Chall, Jeanne S.  1921-1952. <br/><br/>
Should textbooks challenge students? :  the case for easier or harder textbooks / 
Jeanne S. Chall and Sue S. Conard with Susan Harris-Sharples. 
 - New York :  Teachers College Press, Teachers College, Columbia University,  c1991. 
 - x, 163 p. ;  24 cm. 
<br/><br/>Includes bibliographical references (p. 151-156) and index. 
<br/><br/><label>ISBN: </label>0807730653 (cloth : alk. paper) 0807730645 (pbk. : alk. paper) 
<br/><br/><label>LCCN: </label>91011359 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Textbooks--Readability.--United States<br/>Textbooks--Evaluation.--United States
<br/><br/><label>LC Class. No.: </label>LB 3045.8  / .C47 1991