00411nam a2200121Ia 4500008004100000082002100041100002100062245003700083260003800120300001200158490006400170650005500234140224s9999    xx            000 0 und d  a631.461.5(02) L4  aQuispel, A., ed.  aThe biology of nitrogen fixation  aNew YorkbAmerican Elsevierc1974  ax,769p.  aNorth Holland Research Monograph-Frontiers of Biology, v.33  aNitrogen fixation,Micro organisms, nitrogen fixing