AU  - Valdes  Alberto and Dillon  John .L,.
TI  - Economics and the design of small-farmer technology / 
SN  - 0813819105
U1  - 338.1 
PY  - 1979///
CY  - Ames : 
PB  - Lowa State University Press , 
KW  - Agric, Economics
KW  - Small -Farmer
ER  -