Statistics for occurrence #1 of “Indian Territory” in chapter 37 of Philip Henry Sheridan, Personal Memoirs of P. H. Sheridan, General, United States Army .:

...hich to supervise matters in the section of country to be operated in, which district is a part of the Great American Plains, extending south from the Platte River in Nebraska to the Red River in the Indian Territory , and westward from the line of frontier settlements to the foothills of the Rocky Mountains, a vast region embracing an area of about 150,000 square miles. With the exception of a half-dozen milita...
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