Letter from Heinrich Haas to Eugen Klee, January, 1895. Heinrich Haas was the husband (later widower) of Eugen Klee’s sister Amalia.
Eugen Klee Papers
Historical Society of Pennsylvania
“Heinrich Haas to Eugen Klee, January, 1895.” Eugen Klee Papers, Historical Society of Pennsylvania, accessed from German Heritage in Letters, October 26, 2020, https://germanletters.org/items/show/1809