TY  - BOOK
AU  - Bergersen, F. J. ,
TI  - Methods for Evaluating Biological Nitrogen Fixation
SN  - 0 471 27759 2
U1  - 574.133 
PY  - 1980///
CY  - New York
PB  - John Wiley & Sons
KW  - Biological Nitrogen Fixation
ER  -