00410nam a2200133Ia 4500008004100000082001600041100001900057245008000076260004900156300000800205650002300213650001800236653002200254170901s1986    xx            000 0 und d  a589.7bS48C  aSingh, Randhir 0aCurrent Status of Biological Nitrogen Fixation ResearchbNational Symposium  aHisarbHaryana Agricultural Universityc1986  a248  aBotanical sciences  aPure Sciences  aNitrogen fixation