The Catholic Encyclopedia
A titular see in the province of Rhodope on the southern coast of Thrace, now called Bouloustra. It was founded about 656 B.C.
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Obstat, Nihil. Lafort, Remy, Censor. Entry for 'Abdera'. The Catholic Encyclopedia. https://www.studylight.org/encyclopedias/eng/tce/a/abdera.html. Robert Appleton Company. New York. 1914.