TY  - BOOK
AU  - Heady, Earl Orel
TI  - Roots of the farm problem: changing technology, changing capital use, changing labor needs 
AV  - HD 1761 H473
PY  - 1965///
CY  - Ames, Iowa
PB  - Iowa State University, Center for Agricultural and Economic Development
KW  - Agricultura -
KW  - Aspectos económicos -
KW  - Estados Unidos
ER  -