7 treff

Innovation policy for small farmers in the tropics : the economics of technical innovations for agricultural development
by Hans Ruthenberg edited by Hans E. Jahn...
Bok Engelsk 1985
Farming systems in the tropics
Hans Ruthenberg, with contributions by J....
Bok Engelsk 1980
Farming systems in the tropics
Hans Ruthenberg
Bok Språk ikke angitt 1976
Farming systems in the tropics
Hans Ruthenberg
Bok Engelsk 1971
Smallholder farming and smallholder development in Tanzania : ten case studies
edited by Hans Ruthenberg
Bok Tysk 1968
African agricultural production : development policy in Kenya 1952-1965
by Hans Ruthenberg
Bok Tysk 1966
Agricultural development in Tanganyika
by Hans Ruthenberg
Bok Engelsk 1964