"Helen Hunt Jackson and the Campaign for Ponca Restitution, 1880-1881"
https://www.sdhspress.com/journal/south-dakota-history-17-1/helen-hunt-jackson-and-the-campaign-for-ponca-restitution-1880-1881
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"Helen Hunt Jackson and the Campaign for Ponca Restitution, 1880-1881"
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