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Brockhaus-1809: Philadelphia · Philadelphia [2] · Philadelphia
Brockhaus-1911: Philadelphia [3] · Philadelphia [2] · Philadelphia
DamenConvLex-1834: Philadelphia
Herder-1854: Philadelphia [2]
Meyers-1905: Philadelphĭa [2] · Philadelphĭa [1] · New Philadelphia
Pierer-1857: Philadelphĭa [2] · West Philadelphia · Philadelphĭa [1] · New Philadelphia · Philadelphia