00541nam a2200157Ia 4500008004100000082003400041100002000075245005700095260004000152300001200192600001900204650002200223942000700245952011400252999001700366140224s9999    xx            000 0 und d  a581.138:631.46:661.5.001.4 M0  aBergersen, F.J.  aMethods for evaluating biological nitrogen fixation.  aChichesterbJohn Wiley & Sonsc1980  ax,700p.  aF.J. Bergersen  aNitrogen fixation  cBK  00104070aKSDbKSDd2014-02-24l0o581.138:631.46:661.5.001.4 M0p5305r2014-02-24 00:00:00w2014-02-24yBK  c94296d94296