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Piotrków Trybunalski Piotrków Kujawski Piotr Kowalski Piotrkowski Piotrówko Piotrowice-Ochojec Piotr Sowisz Piotrowice Piotrowice Małe, Warmińsko-Mazurskie Piotrowice, Nowe Miasto CountyTài liệu tham khảo
WikiPedia: Piotrków Trybunalski http://www.piotrkow.pl https://bdl.stat.gov.pl/BDL/dane/teryt/jednostka