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 -