TY  - BOOK
AU  - Baum, Emanuel L.
AU  - Heady, Earl Orel.
TI  - Methodological procedures in the economic analysis of fertilizer use data
U1  - 631.88 
PY  - 1956///
CY  - Ames, Iowa
PB  - State College
KW  - Fertilizantes
KW  - Experimentación
ER  -