a. correspondence from the Minnesota Historical Society regarding their manuscript collections, and information on Sitting Bull in St. Paul, Minnesota, 1929.
b. correspondence from The Walker Lithographing and Printing Company regarding scout E. H. Allison, 1929.
c. a typescript from the State Historical Society of North Dakota regarding Catherine Weldon’s relationship with of Sitting Bull, 1932.
d. correspondence with Gerry Theisen regarding White Bull on the reservation, 1957.