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Teofilov (2006). Roman Cities in Bulgaria (bi îngilîzî). Bulgarian Bestseller--National Museum of Bulgarian Books and Polygraphy. ISBN 978-954-463-017-1. World

First Bulgarian Empire

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Sofya

Teofilov (2006). Roman Cities in Bulgaria (bi îngilîzî). Bulgarian Bestseller--National Museum of Bulgarian Books and Polygraphy. ISBN 978-954-463-017-1. World