Werner,Jargen
Participitary development of agricultural innovations : Procedures and methods of on -farm research - Germany GTZ 1993 - 251
3 88085 492 0
Communication
data collection
630 .72 / WER/PA
Participitary development of agricultural innovations : Procedures and methods of on -farm research - Germany GTZ 1993 - 251
3 88085 492 0
Communication
data collection
630 .72 / WER/PA