TY  - GEN
AU  - Bergersen, F.J. , ed.
TI  - Methods for evaluating biological nitrogen fixation
U1  - 574.133 
PY  - 1980///
CY  - New York
PB  - John Wiley and Sons
KW  - Nitrogen-fixation
KW  - Microorganisms
KW  - Enzymes
KW  - Algae
KW  - Biology
ER  -