Letter from Paul Mayers to Chandler C. Anderson, March 18, 1928.
Letter from Paul Myers to Wilder Penfield, August 25, 1930.
Letter from Paul Myers to Wilder Penfield, Februrary 29, 1928.
Letter from Paul Myers to Wilder Penfield, March 17, 1928.
Letter from Paul Myers to Wilder Penfield, March 28, 1928.
Letter from Paul Myers to Wilder Penfield, March 3, 1928.
Letter from Paul Myers to Wilder Penfield, May 16, 1928.
Letter from Paul Myers to Wilder Penfield, October 1, 1928.
Letter from Paul Myers to Wilder Penfield, October 14, 1930.
Letter from Paul Myers to Wilder Penfield, October 5, 1930.
Letter from Paul Myers to Wilder Penfield, September 22, 1928.
Letter from Richard M. Pearce to Wilder Penfield, February 1, 1929.
Letter from Richard M. Pearce to Wilder Penfield, February 18, 1929.
Letter from Richard M. Pearce to Wilder Penfield, July 30, 1929.
Letter from Robert A. Lambert to Wilder Penfield, July 19, 1934.