a. correspondence with Martin Abernathy, 1929.
b. correspondence with Annie H. Abel regarding publications with speeches of Sioux leaders, 1929.
c. correspondence with Edwin P. Andrus, 1929.
d. correspondence with Frank Aydelotte, 1931.
e. correspondence with Adventure Magazine regarding an article which gives a distorted view of the Sioux, 1932.
f. correspondence from the Army War College containing a list of Signal Corps numbers, 1933.
g. miscellaneous research correspondence “A,” 1929-1933.