TY  - BOOK
AU  - Simpson, Ken
TI  - Fertizers and manures
T2  - Longman handbooks in agriculture
SN  - 058244747x
AV  - S633 S55
PY  - 1986///
CY  - London
PB  - Longman
KW  - Fertilizantes
KW  - Abonos
ER  -