000 00338nam a2200133Ia 4500
008 230108s9999 xx 000 0 und d
100 _aLadha J.K.
245 0 _aBiological Nitrogen Fixation for Sustainable Agriculture
260 _bKluwer Academic Publ.
260 _c1990
365 _b0.00
650 _aSoil science
942 _cBK
999 _c249566
_d249566