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 H.M. Hague, August 21, 1946.
Letter from Wilder Penfield to Harold Elliott, December 31, 1942.
Letter from Wilder Penfield to Harold Elliott, December 5, 1940.
Letter from Wilder Penfield to Harold L. Fetherstonhaugh, July 5, 1944.
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.
Letter from Wilder Penfield to J.C. Mackenzie, September 28, 1944.
Letter from Wilder Penfield to J.C. McKenzie, September 19, 1945.