TY  - BOOK
AU  - "De Geus, J.G."
TI  - Fertilizer guide for food grains in the tropics and subtropics
U1  - 631.8(026)   L0 
PY  - 0000///Zurich(Switzerland)
CY  - 1970
PB  - "Centre D'etude, Del'azote"
ER  -