TY  - BOOK
AU  - Heiss, Elwood D
AU  - Hoffman, Charles W
AU  - Obourn, Ellsworth S
TI  - Modern Science teaching: a revision of modern methods and materials for teaching Science
U1  - 507 21st
PY  - 1950///
CY  - New York
PB  - Macmillan
KW  - Science-Study and teaching; Science-Study and teaching-Aids and devices
ER  -