00435nam a22001577a 4500003000400000020001500004082001800019245004200037260004500079300001000124440004400134546001200178650003500190650003600225700001600261OSt  a0521206456  a589.7bNUT/SY  aSymbiotic nitrogen fixation in plants  aLondonbCambridge university pressc1976  a584p.  aInternational Biological ProgrammevV.7  aEnglish  aGenetical aspects and taxonomy  aQuality of legume in inoculants  aNutman, P S