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Food production and consumption : the efficiency of human food chains and nutrient cycles
edited by A. N. Duckham, J. G. W. Jones a...
Bok Engelsk 1976
Farming systems of the world
Duckham, Alec Narraway
Bok Engelsk 1970
American agriculture : its background and its lessons
Duckham, Alec Narraway
Bok Engelsk 1952