Baldwin I z Boulogne (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Baldwin I z Boulogne" in Polish language version.

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1web.archive.org

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Encyklopedia popularna PWN, wyd. 27, Warszawa 1997, s. 62; The Columbia Encyclopedia, Sixth Edition. 2001-05. Baldwin I, Latin king of Jerusalem. [1] (ostatni dostęp 10.08.2007).