TY  - BOOK
AU  - Chall,Jeanne S.
AU  - Conard,Sue S.
AU  - Harris-Sharples,Susan
TI  - Should textbooks challenge students?: the case for easier or harder textbooks 
SN  - 0807730653 (cloth : alk. paper)
AV  - LB 3045.8 .C47 1991
PY  - 1991///
CY  - New York
PB  - Teachers College Press, Teachers College, Columbia University
KW  - Textbooks
KW  - United States
KW  - Readability
KW  - Evaluation
N1  - Includes bibliographical references (p. 151-156) and index
ER  -