Letter to Arnold Carl Klebs, September 29, 1914
Letter to Arnold Carl Klebs, September 22, 1913
Letter to Arnold Carl Klebs, September 12, 1919
Letter to Arnold Carl Klebs, September 12, 1919
Letter to Arnold Carl Klebs, October 25, 1911
Letter to Arnold Carl Klebs, October 12, 1911
Letter to Arnold Carl Klebs, November 8, 1914
Letter to Arnold Carl Klebs, November 8, 1912
Letter to Arnold Carl Klebs, November 4, 1914
Letter to Arnold Carl Klebs, November 4, 1912