00466nam a2200181Ia 4500008004100000020001500041082001800056100001600074245005200090260003400142300000800176650001800184650001800202653001300220653002200233653001100255700001800266170901s1975    xx            000 0 und d  a038707192X  a574.192bB98N  aBurns, R.C. 0aNitrogen Fixation in Bacteria and Higher Plants  aBerlinbSpringer-Verlagc1975  a189  aLife sciences  aPure Sciences  aBacteria  aNitrogen fixation  aPlants  aHardy, R.W.F.