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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 Kujawski //www.worldcat.org/issn/1505-5507 http://www.stat.gov.pl/gus/5840_908_ENG_HTML.htm https://web.archive.org/web/20130405201726/http://...