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 ?)
Letter to William Osler, January 4, 1918
Letter to William Osler, July 1919
Letter to Herbert Stanley Birkett, July 16, 1914