00330nam a2200097Ia 4500008004100000082001900041100002000060245010000080260004400180300000800224140113s9999    xx            000 0 und d  a631.461.5   L4  a"Quispel., Ed."  aThe biology of nitrogen fixation.(North Holland Research Monograph Frontiers of biology vol.33)  a1974bNorth Holland Pub. Co.cAmsterdam  a796