Letter from Alan Gregg to Wilder Penfield, July 20, 1932.
Letter from Alan Gregg to Wilder Penfield, July 25, 1934.
Letter from Alan Gregg to Wilder Penfield, March 23, 1931.
Letter from Alan Gregg to Wilder Penfield, November 20, 1934.
Letter from Alan Gregg to Wilder Penfield, October 15, 1934.
Letter from Alan Gregg to Wilder Penfield, October 30, 1934.
Letter from Alan Gregg to Wilder Penfield, September 18, 1933.
Letter from Alan Gregg to Wilder Penfield, September 22, 1931.
Letter from Alan Gregg to Wilder Penfield, September 6, 1934.
Letter from Alexander Ross to F. Cyril James, January 16, 1945.
Letter from Alfred Newton Richards to Wilder Penfield, September 17, 1931.
Letter from Archibald Malloch to Wilder Penfield, December 7, 1928.
Letter from Archibald P.S. Glassco to George J. Beal, June 21, 1943.
Letter from ARE/MD to Wilder Penfield, June 20, 1935.
Letter from Arthur Childe to Wilder Penfield, July 3, 1940.