フィラデルフィア移民事務所特別取調局記録　1893～1909年 入国帰化局文書　米国国立公文書館所蔵
Records of the Special Boards of Inquiry, District No. 4 (Philadelphia), Immigration and Naturalization Service, 1893 - 1909. Records of the Immigration and Naturalization Service. NARA, RG85. 35mm silver positive microfilm 18 reels with guide.