00850nam a2200205Ia 4500 CTU_122455 210402s9999 xx 000 0 und d 631.584 A425/Vol.1 Allen, Patricia Global perspectives on agroecology and sustainable agricultural systems : proceedings of the Sixth International Scientific Conference of the International Federation of Organic Agriculture Movements Edited by Patricia Allen, Debra Van Dusen Santa Cruz Agroecology Program University of California 1998 Sustainable agriculture,Organic farming,Agricultural ecology,Agricultural systems Congresses,Congresses,Congresses,Congresses Hiếu Trung tâm Học liệu Trường Đại học Cần Thơ