TY  - BOOK
AU  - Baum, Emanuel L.
AU  - Heady, Earl Orel.
TI  - Economic and technical analysis of fertilizer innovation and resource use
U1  - 631.8 
PY  - 1957///
CY  - Ames, Iowa
PB  - State College
KW  - Abonos
KW  - Agricultura
KW  - Aspectos económicos
KW  - Fertilizantes
ER  -