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http://archaeologyinbulgaria.com/2020/11/19/horse-shoulder-blade-with-mysterious-magic-ritual-marks-from-ca-1300-ad-discovered-in-rusocastro-fortress-in-southeast-bulgaria/
Horse Shoulder Blade with Mysterious ‘Magic’ Ritual Marks from ca. 1300 AD Discovered in Rusocastro Fortress in Southeast Bulgaria