Πρόσκληση του Μουσικού Σχολείου Καβάλας για την εκδήλωση ενδιαφέροντος με κλειστές προσφορές για τη διοργάνωση εκπαιδευτικής επίσκεψης σε Αθήνα-Πειραιά

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