<https://brilltravel.com/about-us-brill-travel/about-bulgaria/unesco-intangible-cultural-heritage/>
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"UNESCO Intangible Cultural Heritage in Bulgaria→Koprivshtitsa Folklore Festival, SURVA Pernik, Martenitza, The tradition of carpet-making →"
<https://brilltravel.com/about-us-brill-travel/about-bulgaria/unesco-intangible-cultural-heritage/>