Cyrus Thomas, “Mound Explorations,” in Twelfth Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1890–1891 (Washington: Government Printing Office, 1894), pp. 391–394; Emmert, letter to Thomas dated Mar. 7, 1889 (Smithsonian National Anthropological Archives, MS 2400, Tennessee).