"Dakota Resources: The Javan Bradley Irvine Papers at the South Dakota State Historical Society"
https://www.sdhspress.com/journal/south-dakota-history-37-2/dakota-resources-the-javan-bradley-irvine-papers-at-the-south-dakota-state-historical-society
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"Dakota Resources: The Javan Bradley Irvine Papers at the South Dakota State Historical Society"