TY  - BOOK
T1  - Subsystems and variables.
T2  - Science Curriculum Improvement Study
LA  - English
PP  - Chicago
PB  - Rand McNally
YR  - 1970
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217606706490
OP  - 32
CN  - Q 181 S5 S82 1970 S.M.
KW  - Science : Study and teaching (Elementary).
ER  -