00700nam a2200217Ia 4500 CTU_127147 210402s9999 xx 000 0 und d 632.950973 S745 Spencer, Donald A. The National Pesticide monitoring program : an overview of the first ten years of the program’s operation Donald A. Spencer; Foreword by G. Bruce Wiersma Washington National Agricultural Chemicals Association 1974 Pesticides Environmental aspects United States Nguyên Trung tâm Học liệu Trường Đại học Cần Thơ