The Leland M. Perry papers (1936-1938) contain depositions, correspondence, exhibits pertaining to the application to FCC to extablish the radio station KSUB in Ceder City, Utah. Perry was the co-owner of the radio station KSUB.

The LaMar Petersen papers (1829-2005) consist of book reviews, correspondence, publications, and an interview concerning Petersen and his controversial research regarding the Church of Jesus Christ of Latter-day Saints (LDS Church).

The James Petty papers (1985-2006) contain correspondence, clippings, and research regarding nuclear weapons, aviation, and UFOs.

The Phillips Gallery records (1950s-2006) contain materials reflecting the art and artists associated with this Salt Lake City, Utah, gallery.

The Pioneer Craft House records (1947-1980) contain pamphlets, programs, press releases, correspondence, and lists of members of the Board of Directors and Executive Committee. The Pioneer Craft House is an organization to encourage and market crafts in Salt Lake City.

The Pioneer Theater Guild records (1961-2012) consists of materials documenting the history and ongoing productions of the University of Utah's Pioneer Theater.

The Ethel M. Piper papers (1930-1992) contain correspondence written by Ethel M. Cashmore Piper (b. 1892), as well as additional correspondence, news clippings, awards, eulogies, and a short biography. These items document her teaching career and 100th birthday. Piper was an elementary school teacher in Ogden, Utah (1918-1963).

The Pleasant View Irrigation Company ledger (1877-1916) consists of board meeting minutes, shareholder's lists and other ephemeral materials such as handwritten notes, receipts, correspondence and news clippings.

The Agnes Mero Plenk papers (1947-2004) contain materials relating to Plenk's work in the fields of educational and child psychology. Plenk founded the Salt Lake Children's Center in 1962. She also served as an adjunct professor at the University of Utah.

The Henry P. Plenk papers (1952-1987) contain correspondence, articles written by Plenk, typescripts, interviews, and other documents pertaining to Plenk's book, Medicine in the Beehive State.

The Stephen Post papers (1835-1921) are contained on microfilm reels and include Post's journals, letters from Sidney Rigdon, certificates, receipts, notes, sermons, published works, and other papers. Stephen Post (1810-1879) was an early member of the LDS Church and later member and leader of various schismatic groups.

The Ernest L. Poulson papers (1891-1985) include an autobiography; research material (including correspondence, interviews, notes, and news clippings) on the Deseret Live Stock Company; and other short biographies and articles on land management in Utah, Farmers' State Bank (in Bountiful, Utah), and live stock. Audio cassettes contain interviews with Sterling S. McMurrin, Grace Kerr, and Irvin J. Cox.

The Kenneth R. Prentiss papers (1947-1970) contain correspondence, publications, reports, notes, and notebooks, mostly dealing with Prentiss's work in mechanical engineering on ventilating systems and water boiler systems for airplanes. Prentiss graduated from Purdue University with bachelor's and master's degrees in mechanical engineering. During World War II, he served in the United States Army Air Corps, and later worked in the aerospace industry.

The Preston Nutter Corporation records (1876-1981) document over one hundred years of ranching in Colorado, Arizona, and Utah. The records cover virtually every aspect of cattle ranching, from the buying, selling and shipping of cattle; to the acquisition of land, water, and grazing rights; to the wages and injuries of ranch hands. Also covered are many aspects of the private lives of the Nutter family.

The William M. Purdy papers (1954-1991) consist of personal and professional documents for Purdy (1921-1993), a noted Utah educator. The materials include correspondence, writings, and documents concerning Rowland Hall-St. Mark's School, where Purdy was headmaster from 1968-1981. Also included in the collection is his paper, "An Outline of the History of the Flaming Gorge Area."