003590000a22001210004500060000800000082001500008100002000023245005700043260005200100260000900152300000800161650006800169  a100  a631.42 CUR  aSubha Rao,  N S  aCurrent developments in biological nitrogen fixation  aNew Delhi, Oxford & IBH publishing co. pvt. ltd  c1984  a351  aBiological Nitrogen Fixation/ Nitrogen fixation/ Soil fertility