Letter from Wilder Penfield to Madeleine Ottmann, June 1, 1929.
Letter from Wilder Penfield to Madeleine Ottmann, November 20, 1929.
Letter from Wilder Penfield to Major E.H. Botterell, March 26, 1941.
Letter from Wilder Penfield to Mary Roach, September 16, 1940.
Letter from Wilder Penfield to Max Brödel, October 5, 1933.
Letter from Wilder Penfield to Max Brödel, September 19, 1933.
Letter from Wilder Penfield to Mr. & Mrs. Hodgson, June 26, 1934.
Letter from Wilder Penfield to Mr. Barnet Phillips March 23, 1934.
Letter from Wilder Penfield to N.R. Anderson, January 2, 1942.
Letter from Wilder Penfield to Nolan D.C. Lewis, December 24, 1935.
Letter from Wilder Penfield to Nolan D.C. Lewis, January 14, 1936.
Letter from Wilder Penfield to Nolan D.C. Lewis, July 5, 1935.
Letter from Wilder Penfield to Nolan D.C. Lewis, June 13, 1935.
Letter from Wilder Penfield to Otfrid Foerster, November 9, 1934.
Letter from Wilder Penfield to Paul and Mae Myers, July 16, 1931.