TY - BOOK AU - Foin, Jr. TI - Ecological systems and the environmental : Instructor's manual SN - 0395206677 PY - 1976/// CY - Boston PB - Houghton Mifflin Company KW - Ecologia KW - Sustentabilidade KW - Impacto ambiental KW - PolĂ­tica ambiental ER -