000 00310nam a2200121Ia 4500
008 151015s9999 xx 000 0 und d
020 _a9251034427
245 _aSoil tillage in Africa: needs and challenges
260 _c1993
300 _axiv 190p.
500 _aFAO soils bulletin no- 69
942 _cFAO
_2udc
999 _c23817
_d23817