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Geografiia na Balgarija. T. 3. Fiziko-geografsko i socialno ikonomicesko raionirane. Geography of Bulgaria. Vol. 3. Physical and socio-economic regionalisation
(supprimer)
as a natural complex. The socio-economic part (60 % of the text) also begins with theoretical-methodological clarification and review of the former attempts at regionalisation. According to a concept for 9 socio-economic regions (4 in South and 5 in North