Letter from Arthur Childe to Wilder Penfield, September 1, 1940.
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 Bill Stewart to Wilder Penfield, August 16, 1940.
Letter from Bill Stewart to Wilder Penfield, August 9.
Letter from Bill Stewart to Wilder Penfield, June 29.
Letter from Bill Stewart to Wilder Penfield, November 9.
Letter from Bill Stewart to Wilder Penfield, September 22.
Letter from Boris P. Babkin to Wilder Penfield, June 1, 1933.
Letter from Brenda Milner to Stanley Cobb, September 25, 1953.