TY  - BOOK
ED  - Puerto Rico.
TI  - Lecturas de ciencias biológicas; escuela intermedia
PY  - 1967///
CY  - [Hato Rey, P.R.]
KW  - Biology
KW  - Study and teaching (Secondary)
KW  - Addresses, essays, lectures
KW  - Local
KW  - Puerto Rico
ER  -