Letter to William C. Gorgas, May 4, 1916
Letter to Simon Flexner, May 11, 1916
Letter to Frank L. Pleadwell, May 16, 1916
Letter to Frank L. Pleadwell, May 26, 1916
Letter to Walter Hines Page, May 21, 1916
Letter to John Woolman Churchman, May 31, 1916
Letter to George Cheyne Shattuck, (ca June 1, 1916)
Letter to Robert Gunther, June 5, 1916
Letter to Edward Clark Streeter, June 5, 1916
Letter to John Young Walker MacAlister, June 9, 1916