Appel, Richard Gilmore (1889-1975), Ms. Coll. 083. E&R Library & Archives.
Appel, Richard Gilmore (1889-1975), Ms. Coll. 083. E&R Library & Archives. https://erhistoricalsociety.libraryhost.com/repositories/2/resources/3296 Accessed July 27, 2025.
