00293nam a2200097Ia 4500008004100000082001700041245007300058260002000131300001200151650003200163140224s9999    xx            000 0 und d  a581.138.1 N3  aTechnical Handbook on Symbiotic Nitrogen Fixation; Legume/Rhizobium.  aRomebFAOc1993  av,200p.  aNitrogen fixation,Symbiosis