"Ex-Senator Has Alphabet for All World" Washington Evening Post, Box 1, Folder 5, Item 45
Owen, Robert L. (Robert Latham), 1856-1947. "Ex-Senator Has Alphabet for All World" Washington Evening Post, Box 1, Folder 5, Item 45, Robert L. Owen Collection, 1913-1946. Carl Albert Congressional Research and Studies Center. https://fraser.stlouisfed.org/archival/5300/item/535424, accessed on April 25, 2024.