Collection contains various items related to Pratt's missionary service and letters with his wives and other family. Includes a handwritten diary of Pratt and his wife, Phoebe Sopher Pratt, kept while the Pratts were on a mission for The Church of Jesus Christ of Latter-day Saints in South America from 1851 to 1852. Also included are three handwritten letters and eight fragments of manuscripts by Parley P. Pratt. All items date from 1851 to 1855.

Handwritten diary of Pratt and his wife, Phoebe Sopher Pratt, kept while the Pratts were on a mission for the Mormon Church in South America from 1851 to 1852. Also included are three handwritten letters and eight fragments of manuscripts by Parley P. Pratt.

Collection includes diaries, biographical information, genealogies, and other materials related to the Ann Agatha Walker Pratt family created between 1848 and 1974. Notable items include Ann A. W. Pratt's journal and a handwritten poem by Parley P. Pratt.