Letter from Alan Gregg to Wilder Penfield, September 22, 1931.
Letter from Alan Gregg to Wilder Penfield, September 6, 1934.
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 B.P. Babkin to Wilder Penfield, September 10, 1935.
Letter from Barnet Phillips to Wilder Penfield, April 6, 1934.
Letter from Barnet Phillips to Wilder Penfield, March 27, 1934.
Letter from Barnet Phillips to Wilder Penfield, March 28, 1934.
Letter from Barnet Phillips to Wilder Penfield, March 28, 1934.
Letter from Bernard Berelson to Theodore Rasmussen, December 15, 1955.
Letter from Bernard Berelson to Wilder Penfield, August 15, 1955.
Letter from Boris P. Babkin to Wilder Penfield, June 1, 1933.
Letter from Brenda Milner to Stanley Cobb, September 25, 1953.