Letter from Sir Arthur Currie to Wilder Penfield, September 24, 1932.
Letter from Sir Charles Sherrington to Wilder Penfield, March 4, 1934.
Letter from Sir E.W. Beatty to Wilder Penfield, April 2, 1934.
Letter from Sir E.W. Beatty to Wilder Penfield, July 24, 1934.
Letter from Sir Henry Dale to Wilder Penfield, August 23, 1959.
Letter from Sir Henry Dale to Wilder Penfield, December 4, 1959.
Letter from Sir Henry Dale to Wilder Penfield, January 19, 1960.
Letter from Sir Henry Dale to Wilder Penfield, November 3, 1959.
Letter from Stanley Ellis to Wilder Penfield, July 23, 1940.
Letter from T.D.K. Rooney to the Commanding Officer of the MNI, May 19, 1945.
Letter from the Associate Attending Surgeon to Dr. Frederick Keppel, Februrary 9, 1925.
Letter from the Eastman Kodak Company to James Preston Robb, December 26, 1945.
Letter from the Secretary to Dr. Archibald, Ms. Pickels, to Wilder Penfield, March 20, 1928.
Letter from the Secretary to Dr. Penfield to Charles F. Martin, June 17, 1931.
Letter from Theodore H. Weisenburg to Wilder Penfield, February 20, 1934.