TY  - BOOK
AU  - 
AU  - Martin, Ralph E.,
ED  - 
ED  - 
ED  - 
ED  - 
SN  - 205195857
SN  - 2
PY  - 1997///];copyright 1997.46
CY  - Boston
PB  - Allyn and Bacon
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Study and teaching.;Study and teaching (Elementary)
KW  - Science;Science;Activity programs in education
N1  - Includes bibliographical references (p. 644-651) and index; 5
ER  -