Treaty between the United States of America and the Nez Perce' Tribe of Indians Concluded June 9, 1863 Ratificiation advised April 17, 1867 Proclaimed April 20, 1867, 1863-06-09. Native American Treaties Collection, MSS-039. Manuscripts. https://aspace.ll.georgetown.edu/public/repositories/3/archival_objects/2737 Accessed April 05, 2026.