TY  - BOOK
AU  - International Biological Programme Technical Meetings on Bio
TI  - Biological nitrogen fixation in natural and agricultural habitats: proceedings
U1  - 631.84 I-5B 
PY  - 1971///
CY  - The Hague
PB  - Martinus Nijhoff
KW  - NITROGEN -- FIXATION
KW  - SOILS
ER  -