TY  - BOOK
AU  - Hoff,Arthur G.
TI  - Secondary-school science teaching : a textbook on how to teach science in the junior and senior high school 
U1  - 375.5 
PY  - 1950///.
CY  - Toronto : 
PB  - Blakiston Company, 
KW  - Science--Study and teaching (Secondary)
N1  - Includes index.
ER  -