TY  - BOOK
AU  - Blough,Glenn O.
AU  - Schwartz,Julius
TI  - Elementary school science and how to teach it
SN  - 0030313120
AV  - LB1585.3 .B55
PY  - 1990///
CY  - Philadelphia
PB  - Harcourt brace
KW  - Science--Study and teaching (Elementary)--United States
ER  -