Lecturas de ciencias biológicas; escuela intermedia.
Lecturas de ciencias biológicas; escuela intermedia.
- [Hato Rey, P.R.] 1967.
- 204 p. illus., draws.
Biology--Study and teaching (Secondary)--Addresses, essays, lectures.
Puerto Rico--Biology.
Biology--Study and teaching (Secondary)--Addresses, essays, lectures.
Puerto Rico--Biology.