00654nam a2200193Ia 4500 CTU_30112 210402s9999 xx 000 0 und d 630.715 A341/T1 Hartmut Albrecht Rural development series Agricultural extension; T1 Hartmut Albrecht, Eberhard Grober, Georg Diederich, Herbert Bergmann, Peter Keller, Volker Hoffmann Eschborn Technical Cooperation - Federal Republic of Germany 1989 agricultural extension work Liên, 990302 Trung tâm Học liệu Trường Đại học Cần Thơ