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GEOPAN PUBLISHES THE ALBUM "THE OLD BALCHIK" IN ENGLISH
PROFESSOR GEORGE MARKOV ABOUT "THE OLD BALCHIK"
THE ANCIENT BULGARIAN DEFENSE LINE "ERKESIA"
DIGITAL ARCHIVE „TRAKIA
EXHIBITION „BULGARIA IN THE EUROPEAN' IMAGINATIONS
The protected habitats in Strandja mountain
The exhibition „The protected territories in Strandja mountain“