Statistics for occurrence #1 of “Yankton Indians” in entry yankton-indians of Harper's Encyclopedia of United States History:

... Yankton Indians
A tribe of the Siouan family. In 1899 there were 1,061 lower Yanktonai Sioux at the Crow Creek agency, in South Dakota; 1,...
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Entity Corpus Doc Corpus Doc  
Yankton Indians 8 8 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.