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WikiPedia: Kotwica http://www.info-pc.home.pl/Whatfor/baza/historia_k... http://projektpilecki.pl/index.php/52-tworczyni-sy... http://www.kotwica-walczaca.waw.pl/ https://web.archive.org/web/20080526145431/http://... https://web.archive.org/web/20090527023335/http://... https://web.archive.org/web/20130815002840/http://... https://web.archive.org/web/20200920111958/http://...