The collection consists of historical sketches, minutes of meetings, letters, journals, diaries, and autobiographical sketches including histories written by R.E. Porter and George S. Tanner relating to Mormon settlements in Arizona, chiefly at Joseph City and other points along the Little Colorado River.

The collection includes minutes and letters of the United Order of Joseph City; and letters and extracts of news stories regarding the Little Colorado River Stake. Journals, diaries, and autobiographical sketches of Mormon pioneers in Arizona are present for William C. Allen, John A. Blythe, James S. Brown, Daniel H. McAllister, Joseph H. Richards, Andrew S. Rogers, William H. Solomon, Brigham Stowell, John W. Tate, and the McLaws, Bradshaw, and Owens families.