000 00343nam a2200133Ia 4500
008 100324s9999 xx 000 0 und d
100 _aRoberts
245 _aAgricultural extension in Africa
260 _c1989
_bWorld Bank
_aWashington DC
366 _b1989
650 _aAgriculture
942 _cBK
999 _c72753
_d72753