TY  - BOOK
AU  - Bockman, Oluf Chr
AU  - Kaarstad, Ola
AU  - Lie, Ole H
AU  - Richards, Ian 
TI  - Agriculture and fertilizers: : Fertilizers in perspective 
SN  - 82-90861-01-X
PY  - 1990///
CY  - Norway: 
PB  - Norsk Hydro, 
KW  - Agriculture
KW  - Feed
KW  - Nutrients
ER  -