TY  - BOOK
AU  - Heady, Earl O., ed.
TI  - Economic models of agricultural and conservation and environmental improvement
SN  - 0813805236
U1  - 333.7616 21st ed.
PY  - 1992///
CY  - U.S.A
PB  - Iowa State University Press
KW  - Agricultural ecology
KW  - Soil conservation
KW  - United States
KW  - Vocke
KW  - Gary F., ed
N1  - Index: p. 273-75
ER  -