TY  - BOOK
AU  - Stewart, D.p
TI  - Nitrogen fixation by Free living Micro Organisms
SN  - 0521207088
U1  - 572.54529 STE 
PY  - 1975///
CY  - Cambridge
PB  - Cambridge university
KW  - Nitrogen - fixation
KW  - nitrogen- fixing Micro-organisms
ER  -