MS 1001 Cayuse, Umatilla, Walla Walla comparative vocabulary Page 54

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Informant for "Umatilla" given on title page as Old Pus; informant for the Cayuse is Yah-tin Wi-shi-an-sha. Second language identified as probably Walla Walla by Bruce J. Rigsby, University of Toronto, in letter of March 22, 1965, in which he states that this "is definitely not Umatilla, but is rather one of the Northeast Sahaptin dialects, most likely Walla Walla." In John Wesley Powell schedule that is part of Introduction to the Study of Indian Languages