Zimmerman, William. Letter to Joseph Brooks. Washington: Office of Indian Affairs, US Dept. of the Interior, stamped 12 Dec. 1938. Correspondence no. Ind-Org. 71526-38.  p.
Reports that of the 209 Siouan applicants for benefits under the Indian Reorganization Act, 22 were 1/2 or more Indian blood. Lists the 22, with their age, number of children, and parents’ names.