TY  - BOOK
AU  - Simpson, Ken.
TI  - Fertilizers and manures
T2  - Longman handbooks in agriculure
U1  - 631.8 
PY  - 1986///
CY  - London
PB  - Longman
KW  - Abonos
KW  - Fertilizantes
N1  - 31-211
ER  -