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Brockhaus-1911: Douglas [3] · Douglas [4] · Douglas · Douglas [2]
Herder-1854: Douglas [2] · Douglas [1]
Meyers-1905: Douglas [3] · Douglas [1] · Akers-Douglas
Pagel-1901: Carden, Henry Douglas
Pierer-1857: Douglas [3] · Douglas · Douglas [1] · Douglas [2]