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