000 00317nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aAyanaba (A) and Dart (PJ)
245 0 _aBiological nitrogen fixation forming systems of the tropics
260 _bJohn Wiley
260 _c1977
365 _b41.50
942 _cBK
999 _c203677
_d203677