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2
-
Farmer evaluations of technology : preference ranking / MarÃa del Pilar Guerrero, Jacqueline A. Ashby, Teresa Gracia.
- Centro internacional de agricultura tropical [etc.],
- 1993.
- Cali :
-
Evaluating technology with farmers : a handbook / Jacqueline A. Ashby.
- Centro internacional de agricultura tropical (CIAT),
- 1990.
- Cali :