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Bene, J.G., H.W. Beall, and A. Cote (1977) The Tropical 

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Food and Agriculture Organization of the U-N. (1977) 

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Kovda, V.A. (1971) The problem of biological and 



economic productivity of the earths land areas. 

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National Research Council (1977) Supporting Papers: 

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Schultz, T.W. , ed. (1978) Distortion of Agricultural 

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Takase, K. and T. Kano (1969) Development strategy of 

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U.S. Department of Agriculture (1975) Soil taxonomy: a 

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