Part of the Frick Collection Archives Repository
#142: Pittsburgh Plate Glass Co., 1900-1920, Box: 21, Folder: 14. Henry Clay Frick Papers, Series V: Subject Files, FFP.01.05. Frick Collection Archives.
#142: Pittsburgh Plate Glass Co., 1900-1920, Box: 21, Folder: 14. Henry Clay Frick Papers, Series V: Subject Files, FFP.01.05. Frick Collection Archives. https://archives.frick.org/repositories/3/archival_objects/8265 Accessed June 27, 2025.
