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The grain-livestock economy of West Germany : with projections to 1970 and 1975
Rossmiller, George E., (1968)
Farm management in West Africa
Phillips, T. A., (1961)
Tropical agriculture : the development of production
Wrigley, Gordon, (1961)
The animal farm : a mathematical model for the discussion of social standards for control of the environment
Thomas jr., Harold A., (1972)
On the efficient use of High Aswan Dam for hydropower and irrigation
Thomas jr., Harold A., (1966)
Waste disposal in natural waterways