000 00327nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aAyanaba (A) and Dart (RJ)
245 0 _aBiological ntrogen fixation in farming systems of the rropics
260 _b"John witely, USA"
260 _c1977
365 _b41.50
942 _cBK
999 _c203485
_d203485