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Krug, S.H., 1911, Box: 30, Folder: 54. Henry Clay Frick Papers, Series IV: Receipts, FFP.01.04. Frick Collection Archives.
Krug, S.H., 1911, Box: 30, Folder: 54. Henry Clay Frick Papers, Series IV: Receipts, FFP.01.04. Frick Collection Archives. https://archives.frick.org/repositories/3/archival_objects/7016 Accessed December 10, 2025.
