"Dakota Resources: The John R. Brennan Family Papers at the South Dakota Historical Resource Center"
https://www.sdshspress.com/journal/south-dakota-history-14-1/dakota-resources-the-john-r-brennan-family-papers-at-the-south-dakota-historical-resource-center
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"Dakota Resources: The John R. Brennan Family Papers at the South Dakota Historical Resource Center"
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