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Books about Bossilkov:
Beato Eugenio Bossilkov. Morire per la fede by Pierluigi Eugenio (Jan 1, 2012)
Wiki information Bossilkov:
Blessed Eugene Bossilkov, born Vincent Bossilkov, was a member of the Passionist Congregation, bishop of Nicopolis and martyr in the Communist campaign in Bulgaria against religion. He had studied in Rome for his doctorate at the Pontifical Oriental...