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Brockhaus-1911: Etzel [2] · Etzel
Goetzinger-1885: Etzel
Herder-1854: Etzel
Meyers-1905: Etzel [3] · Etzel [2] · Etzel [1]
Pierer-1857: Etzel [2] · Etzel [1]
Vollmer-1874: Etzel