"Scouting along the Path of the Union Pacific Railroad in 1868: A Narrative by Colonel Richard Irving Dodge"
https://www.sdhspress.com/journal/south-dakota-history-43-1/scouting-along-the-path-of-the-union-pacific-railroad-in-1868-a-narrative-by-colonel-richard-irving-dodge
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"Scouting along the Path of the Union Pacific Railroad in 1868: A Narrative by Colonel Richard Irving Dodge"
