TY  - BOOK
AU  - Heady, Earl Orel 
AU  - Johnson, Glenn L.
AU  - Hardin, Lowell S.
ED  - North Central Farm Management Research Committee
TI  - Resources productivity, returns to scale, and farm size
U1  - 631.1072 
PY  - 1956///
CY  - Ames
PB  - The Iowa State College Press
KW  - Farm management research
KW  - Productivity accounting
ER  -