00339nam a2200109Ia 4500008004100000082002400041100002400065245005700089260005100146300001000197650002200207140113s9999    xx            000 0 und d  a581.138.1(082.2) M4  a" Subba Rao, N. S."  aCurrent developments in biological nitrogen fixation  b"New Delhi : Oxford & IBH publishing Co, 1984"  a351p.  aNitrogen fixation