Letter from H.B. van Wesep to Wilder Penfield, September 4, 1935.
Letter from H.M. Hague to Wilder Penfield, August 23, 1946.
Letter from Harold Elliott to Wilder Penfield, 1942.
Letter from Harold Elliott to Wilder Penfield, August 31, 1942.
Letter from Harold Elliott to Wilder Penfield, December 4, 1942.
Letter from Harold Elliott to Wilder Penfield, November 11, 1940.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, April 11, 1945.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, June 12, 1944.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, June 14, 1944.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, June 19, 1944.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, June 26, 1944.
Letter from Harold L. Fetherstonhaugh to Wilder Penfield, June 26, 1944.
Letter from Harold to Wilder Penfield, January 4, 1941.
Letter from Herbert H. Jasper to Robert S. Morison, February 19, 1953.
Letter from Herbert Holt to Wilder Penfield, September 18, 1934.