00434nam a2200157Ia 4500008004100000020001800041082001600059100002100075245005600096260003500152300000800187650002300195650001800218653002200236700001800258170901s1990    xx            000 0 und d  a9780412346804  a589.7bS65N  aSprent, Janet. I 0aNitrogen Fixing OrganismsbPure and Applied Aspects  aLondonbChapman and Hallc1990  a256  aBotanical sciences  aPure Sciences  aNitrogen fixation  aSprent, Peter