Letter to Harvey Cushing, April 12, 1920
Letter to Harvey Cushing, April 13, 1920
Letter to Harvey Cushing, April 14, 1919
Letter to Harvey Cushing, April 14, 1921
Letter to Harvey Cushing, April 16, 1913
Letter to Harvey Cushing, April 17, 1920
Letter to Harvey Cushing, April 20, 1920
Letter to Harvey Cushing, April 20, 1921
Letter to Harvey Cushing, April 21, 1920
Letter to Harvey Cushing, April 24, 1919