TY  - BOOK
T1  - Produced as a joint project of National Science Teachers Association and National Aeronautics and Space Administration.
LA  - English
PP  - Darien, Conn.
PB  - Teachers Pub.
YR  - 1964
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217603752015
CN  - LB 1585 N38
KW  - Science : Study and teaching (Elementary).
ER  -