Letter from Wilder Penfield to J.C. Meakins, January 23, 1928.
Letter from Wilder Penfield to J.C. Meakins, January 8, 1945.
Letter from Wilder Penfield to J.C. Meakins, March 2, 1928.
Letter from Wilder Penfield to J.C. Meakins, May 20, 1942.
Letter from Wilder Penfield to J.C. Simpson, March 22, 1930.
Letter from Wilder Penfield to J.C. Simpson, October 29, 1931.
Letter from Wilder Penfield to J.C. Simpson, September 26, 1929.
Letter from Wilder Penfield to J.W. McConnell, March 27, 1940.
Letter from Wilder Penfield to James Bordley, July 15, 1941.
Letter from Wilder Penfield to James Bordley, June 18, 1941.
Letter from Wilder Penfield to John F. Bush, July 2, 1932.
Letter from Wilder Penfield to John Kershman, June 14, 1944.
Letter from Wilder Penfield to Jonathan C. Meakins, June 27, 1944.
Letter from Wilder Penfield to Louis Ehret, August, 22 1930.
Letter from Wilder Penfield to Lt.Col. W. Leggat, September 5, 1945.