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Piotr Zieliński Piotr Rogucki Piotr Kowalski Piotrków Trybunalski Piotr Trochowski Piotr Popik Piotr Adamczyk Piotr Jaroszewicz Piotr Stachiewicz Piotr Adamczyk (nhà văn)Tài liệu tham khảo
WikiPedia: Piotr Kowalski http://nga.gov.au/internationalprints/tyler/DEFAUL... http://static.panoramio.com/photos/original/154534... http://www.piotrkowalski.com/ http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://pagesperso-orange.fr/brouillard.precis/kowa... http://data.bibliotheken.nl/id/thes/p070624380 http://www.arsmeteo.org/arsmeteo/main.php?page=eve... http://leoalmanac.org/journal/Vol_12/lea_v12_n05.t... http://csw.art.pl/new/2000/kowalski_e.html http://mak.bn.org.pl/cgi-bin/KHW/makwww.exe?BM=1&N...