00400nam a2200133Ia 4500008004100000082001700041100002200058245004200080260004800122300001700170490004100187600001600228650002200244140224s9999    xx            000 0 und d  a581.138.1 L6  aNutman, P.S., ed.  aSimbiotic nitrogen fixation in plants  aCambridgebCambridge University Pressc1976  axxviii,584p.  aInternationl Biological Programme, 7  aP.S. Nutman  aNitrogen fixation