TY  - GEN
AU  - Postgate, John
TI  - Nitrogen fixation
T2  - 92
SN  - 0 7131 2687 6
U1  - 581.133 5 POS 
CY  - New Delhi, Oxford & IBH publishing co. pvt. ltd
KW  - Nitrogen fixation/ Nitrogen cycle- Plants
ER  -