Letter from Wilder Penfield to C.E. Cross, May 25, 1940.
Letter from Wilder Penfield to C.E. Cross, May 7, 1940.
Letter from Wilder Penfield to C.E. Cross, May 9, 1941.
Letter from Wilder Penfield to C.E. Cross, October 15, 1940.
Letter from Wilder Penfield to C.E. Cross, October 31, 1940.
Letter from Wilder Penfield to Charles F. Martin, April 2, 1940.
Letter from Wilder Penfield to Charles Miller Fisher, August 1, 1946.
Letter from Wilder Penfield to Colin Russel December 5, 1940.
Letter from Wilder Penfield to Colin Russel, April 22, 1941.
Letter from Wilder Penfield to Colin Russel, April 7, 1941.
Letter from Wilder Penfield to Colin Russel, August 15, 1940.
Letter from Wilder Penfield to Colin Russel, July 5, 1940.
Letter from Wilder Penfield to Colin Russel, March 26, 1941.
Letter from Wilder Penfield to Colin Russel, May 17, 1941.
Letter from Wilder Penfield to Colin Russel, September 16, 1940.