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An economic survey of farming in a wet, long-grass area of Toro
(1968)
Agrarberichterstattung Nordrhein-Westfalen 1983
(1985)
Sociological research and rural development policy, 1970-1980 : a review with policy implications of socio-economic research, conducted by or in assoc. with Rural Sociology Unit, Ministry of Agriculture, Botswana
Odell, Malcolm J., (1980)