The Chart of the Distribution of Oaks and chestnuts was based on elements collected in the “Preparation Letter” of the Agricultural and Forestry Charter, on the scale 1:250,000, prepared by the Service of Recognition and Agrarian Planning (SROA), this service published, in 1965, a distribution letter of the Castanheiro on the scale 1:500,000.
This letter is available (link below) in image format (mr. sid), accompanied by explanatory news.
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Some basic informations about API Store ®.
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