TY  - BOOK
AU  - GRAHAM,  Peter H
AU  - HARRISO, Susan C
TI  - Biological nitrogen fixation technology for tropical agriculture
U1  - 631.461.5(213.5) 
PY  - 1981///
CY  - Colombia
PB  - Centro Inerracional
KW  - Nitrogen fixation
KW  - Rhizobium
ER  -