Cushing's notes, 1905
Letter to Warden, October 2, 1919
Letter to John George Adami, January 3, 1914
Cushing's notes, 1909
Letter to Richard Pearson Strong, January 1, 1919
Letter to George Sarton, (5,? 1917?)
Extract from Archibald Malloch's journal, July 4, 1915
Extract from Archibald Malloch's journal, January 1, 1916
Cushing's notes, 1907
Cushing's notes, (1915 ?)