Plik:ETH-BIB-Paul-Armand Challemel-Lacour (1827-1896), Professor am eidg. Polytechnikum 1856-1859-Portrait-Portr 05548.tif (cropped).jpg

Ten materiał przeszedł do domeny publicznej w kraju pochodzenia, jak również w państwach i terytoriach, gdzie prawo autorskie wygasa w ciągu 70 lat po śmierci autora.

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