Statistics for occurrence #1 of “Indian Territory” in chapter 1 of Wiley Britton, Memoirs of the Rebellion on the Border 1863.:

... hope that I have improved the expression in various ways. I have endeavored to make the work a panoramic view of military operations and events on the borders of Missouri, Kansas, Arkansas and the Indian Territory during the year 1863. Eighteen years have now elapsed since I collected the material from which my Memoirs are written, and I have not as yet met with a single book pretending to give any kind of an ...
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