TY  - BOOK
ED  - E.U.A. Agricultural Research Service
TI  - Superphosphate ; its history, chemistry and manufacture
U1  - 668.62 
PY  - 1964///
CY  - Washington
PB  - A.R.S.
KW  - Fertilizantes fosfatados
N1  - Incluye bibliografía
ER  -