Letter from Wilder Penfield to Francis McNaughton, January 26, 1960.
Letter from Wilder Penfield to Frederick P. Keppel, February 21, 1929.
Letter from Wilder Penfield to Frederick P. Keppel, March 7, 1929.
Letter from Wilder Penfield to George McDonald, February 7, 1935.
Letter from Wilder Penfield to George McDonald, May 7, 1934.
Letter from Wilder Penfield to George [Jerzy] Chorobski, November 9, 1934.
Letter from Wilder Penfield to Gordon Holmes, May 9, 1934.
Letter from Wilder Penfield to H. Rowan Gaither Jr., August 6, 1955.
Letter from Wilder Penfield to H. Rowan Gauthier Jr., February 5, 1959.
Letter from Wilder Penfield to H.B. van Wesep, September 3, 1935.
Letter from Wilder Penfield to Herbert Jasper, January 26, 1960.
Letter from Wilder Penfield to Herbert N. Shenton, June 14, 1935.
Letter from Wilder Penfield to Hugh Auchincloss, November 10, 1934.
Letter from Wilder Penfield to Hugh Cairns, November 9, 1934.
Letter from Wilder Penfield to J. Simpson, June 24, 1930.