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Brockhaus-1837: Krug
Brockhaus-1911: Krug von Nidda · Krug
Eisler-1912: Krug, Wilhelm Traugott
Herder-1854: Krug
Meyers-1905: Krug [3] · Krug [2] · Krug [1]
Pataky-1898: Krug, Frau Maria · Krug, Charlotte · Krug, Anna
Pierer-1857: Krug [2] · Krug [1]