Charles, Duke of Courland (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Charles, Duke of Courland" in English language version.

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books.google.com

Genealogie ascendante jusqu'au quatrieme degre inclusivement de tous les Rois et Princes de maisons souveraines de l'Europe actuellement vivans [Genealogy up to the fourth degree inclusive of all the Kings and Princes of sovereign houses of Europe currently living] (in French). Bourdeaux: Frederic Guillaume Birnstiel. 1768. p. 100.