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Brockhaus-1911: Blumenthal [3] · Blumenthal [2] · Blumenthal
Meyers-1905: Blumenthal [1]
Pagel-1901: Blumenthal, Ferdinand
Pataky-1898: Blumenthal, Louise Johanne Leopoldine
Pierer-1857: Blumenthal [3] · Blumenthal [2] · Blumenthal [1]