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Die optimale Betriebsgrösse in der Landwirtschaft : eine dogmenhistorische Untersuchung
Gal, Michael, (1963)
Agrarian structure and productivity in developing countries : a study prepared for the International Labour Office within the framework of the World Employment Programme
Berry, R. Albert, (1979)
Smaller farmlands can yield more. Raising agricultural productivity by technological change
(1969)