Letter from Theodore Rasmussen to Bernard Berelson, August 31, 1955.
Letter from Theodore Rasmussen to Bernard Berelson, December 20, 1955.
Letter from Theodore Rasmussen to D.L. Thomson, August 24, 1955.
Letter from Theodore Rasmussen to The Ford Foundation, June 25, 1955.
Letter from W.H. Kippen to Wilder Penfield, April 1945.
Letter from W.W. Francis to Wilder Penfield, March 27, 1934.
Letter from W.W. How to W. Davison, May 4, 1916.
Letter from Walther Spielmeyer to Wilder Penfield, September 14, 1934.
Letter from Ward J. MacNeal to Wilder Penfield, February 14, 1935.
Letter from Ward J. MacNeal to Wilder Penfield, January 22, 1935.
Letter from Ward Wheelock to Wilder Penfield, 8 Oct. 1954.
Letter from WGP to Charles Martin, February 24, 1928.
Letter from WGP to Charles Martin, January 30, 1928.
Letter from Wilburt C. Davison to Helen Kermott Penfield, September 21, 1943.
Letter from Wilder Graves Penfield to R. Carmichael Tilghman, November 9, 1972.