Marriage of son Wilhelm Blau: "Österreich, Niederösterreich, Wien, Matriken der Israelitischen Kultusgemeinde, 1784-1911", citing Digital film/folder number: 005202738; Image number: 118, FamilySearch Record: 6KCD-D8PC (accessed 20 January 2024) FamilySearch Image: 33S7-8BKB-KQT, Johann Blau's son Wilhelm Blau marriage to Laura König on 14 Jan 1877 in Wies, Melk, Niederösterreich, Österreich.
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