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2
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Definitions of soil units for the soil map of the world / prep. by R. Dudal.
- FAO. Land and water development division. World soil resources office,
- 1968.
- Rome :
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A new system of soil appraisal in terms of actual and potential productivity (first approximation) / J. Riquier, J.P. Cornet and D.L. Bramao.
- FAO. Land and water development division. World soil resources office,
- 1968.
- Rome :