Letter from Edward Archibald to Wilder Penfield, September 22, 1927.
Letter from Edward Archibald to Wilder Penfield, September 27, 1934.
Letter from Emma M. Abbett (Secretary to Dr. Aydelotte) to Wilder Penfield, March 7, 1928.
Letter from F.C.G. to Wilder Penfield.
Letter from Francis Cooley Hall to Wilder Penfield, October 5, 1934.
Letter from Frederick P. Keppel to Wilder Penfield March 4, 1929.
Letter from George J. Beal to Archibald P. S. Glassco, June 26, 1934.
Letter from George McDonald to Wilder Penfield, February 8, 1935.
Letter from Gladys E. Russell (Secretary to Dr. Gregg) to Wilder Penfield, October 6, 1931.
Letter from Gordon Petrie to Wilder Penfield, June 28, 1929.
Letter from H.B. van Wesep to Wilder Penfield, August 27, 1935.
Letter from H.B. van Wesep to Wilder Penfield, September 4, 1935.
Letter from Herbert H. Jasper to Robert S. Morison, February 19, 1953.
Letter from Herbert Holt to Wilder Penfield, September 18, 1934.
Letter from Herbert N. Shenton to Wilder Penfield, June 12, 1935.