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Brockhaus-1809: Delta
Brockhaus-1837: Delta
Brockhaus-1911: Delta
DamenConvLex-1834: Delta
Herder-1854: Delta
Lueger-1904: Delta
Meyers-1905: Delta [3] · Delta-Metall · Delta [2] · Delta del Orinoco · Delta [1]
Pierer-1857: Delta