TY  - BOOK
AU  - Ramirez,Mariecon Guerrero
TI  - Research-based self-learning packages on ecological concepts
U1  -  Thesis 574.507 G937r 2001 
PY  - 2001///
KW  - Ecology
KW  - Study and teaching (Secondary)
KW  - Aids and devices
N1  - Thesis (M.A.Ed.) - Mariano Marcos States University, Laoag City; Bibliography: leaves 42-44
ER  -