TY  - BOOK
T1  - Ecosystems student manual.
T2  - Science Curriculum Improvement Study
LA  - English
PP  - Berkeley, CA
PB  - Science Curriculum Improvement Study
YR  - 1970
ED  - Trial ed.
UL  - https://tuklas.up.edu.ph/Record/UP-99796217606706511
OP  - 27
CN  - Q 181 S5 E46 1970 S.M.
KW  - Science : Study and teaching (Elementary).
KW  - Ecology (Biology) : Study and teaching.
ER  -