TY  - BOOK
AU  - Gayon, Edwehna Elinore P.,
AU  - Punzalan, Anekua E.,
TI  - Our changing environment
SN  - 9789714601888 [paperback]
PY  - 2011///
CY  - Makati City, Philippines
PB  - DIWA LEARNING SYSTEMS INC.
KW  - Social Studies
ER  -