Letter from Wilder Penfield to R.S. Morison, February 14, 1953.
Letter from Wilder Penfield to Rene Leriche, November 10, 1934.
Letter from Wilder Penfield to Richard M. Pearce, February 14, 1929.
Letter from Wilder Penfield to Richard M. Pearce, February 21, 1929.
Letter from Wilder Penfield to Richard M. Pearce, January 28, 1929.
Letter from Wilder Penfield to Richard M. Pearce, January 28, 1929.
Letter from Wilder Penfield to Richard M. Pearce, January 28, 1929.
Letter from Wilder Penfield to Richard M. Pearce, January 30, 1929.
Letter from Wilder Penfield to Richard M. Pearce, July 12, 1929.
Letter from Wilder Penfield to Robert A. Lambert, July 25, 1934.
Letter from Wilder Penfield to Robert A. Lambert, July 25, 1934.
Letter from Wilder Penfield to Robert A. Lambert, July 5 1934.
Letter from Wilder Penfield to Robert C. Bates, October 16, 1959.
Letter from Wilder Penfield to Robert Lambert, June 28, 1934.
Letter from Wilder Penfield to Robert S. Morison, April 30, 1953.