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http://archaeologyinbulgaria.com/2020/04/27/still-europes-deadliest-terrorist-attack-95-years-since-the-st-nedelya-cathedral-bombing-by-bulgarian-communists-funded-by-the-soviet-union/
Still Europe’s Deadliest Terrorist Attack: 95 Years since the St. Nedelya Cathedral Bombing by Bulgarian Communists Funded by the Soviet Union