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Department of the Interior
Office of the Assistant Secretary—Indian Affairs
Attention: Office of Federal Acknowledgment
Mail Stop 4071 MIB
1849 C Street NW
Washington, DC 20240
(202) 513-7650
(202) 219-3008
Hours of operation: Monday through Friday, 8:00 a.m. to 5:00 p.m., Eastern Time; holidays excluded.
indianaffairs.gov
An official website of the U.S. Department of the Interior
