TY  - BOOK
AU  - Blough,Glenn Orlando
AU  - Schwartz,Julius
ED  - Holt, Rinehart and Winston 
TI  - Elementary school science and how to teach it
SN  - 0030915392
U1  - 372.35044 23
PY  - 1974///.
CY  - New York: 
PB  - Holt, Rinehart and Winston, 
KW  - Science
KW  - Study and teaching (Elementary)
N1  - Includes bibliography p. 713-741 and index
ER  -