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Note : Soil maping information is not homogeneous
between the three countries. In some cases (France and Portugal)
one color agregates several soil classes. The first class indicated
in the list for each color corresponds to the main class in the
area.
Sources : INRA, Carte pédologique de
la France à l'échelle du millionième, FAO
soil units in the FAO/UNESCO Soil Map of the World
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