TY  - BOOK
AU  - Nutman,P.S.
TI  - Symbiotic nitrogen fixation in plants
T2  - International biological programme
SN  - 0521206456
U1  - 589.95041 
PY  - 1976///
CY  - Cambridge, Eng.
PB  - Cambridge University Press, 
KW  - NITROGENO
KW  - FIJACION
ER  -