TY  - BOOK
AU  - Balce, Marina E.
AU  - Belen, Josefina G.
AU  - Punzalan, Amelia E.
AU  - Ronda, May R.
AU  - Rosales, Edmund M.
AU  - Santos, Lea O.
TI  - Sourcebook on practical work for teacher trainors: elementary school science 
SN  - 971-8693-26-2
AV  - QA 135.5  .So84 1997 
CY  - Quezon City
PB  - Institute for Science and Mathematics Education Development University of the Philippines
KW  - Mathematics
KW  - sears
ER  -