TY  - BOOK
AU  - Callicott,J.Baird
TI  - In defense of the land ethic: essays in environmental philosophy 
T2  - SUNY series in philosophy and biology
SN  - 0887068995
PY  - 1989///
CY  - Albany, [New York]
PB  - State University of New York Press
KW  - Ética
KW  - Medio ambiente
KW  - Aspectos morales
ER  -