Includes handwritten, typed, and shorthand diaries. Many are personal diaries from 1916 to 1961. Some of his diaries from the same time period are more business oriented. These include diaries about military service, ranches/farms/meat, cattle diseases, and several other subjects. Also includes his diary outlines and excerpts from his father's diary.

Includes letters and correspondence written to Clark just before or just after his death. It also contains obituaries, newspaper articles about his funeral, and letters requesting that his name be removed from mailing lists.

Contains his embossing stamp (unfortunately the lower plate is missing), line of authority cards, stationary, to do lists and an address book.

Contains a few items concerning Clark's personal library.

Contains seminary and institute directories from 1960-1961 and twelve volumes of the annual report of the Church Welfare Plan.

Includes notebooks and diaries of Clark's wife and children, including an autograph book with signatures of prominent figures. It also includes several items about theater and drama, including some play scripts.

Contains a few photographs of the KSL radio tower when it was new, images from the dedication of Pioneer Pipeline, several of a trip to Nauvoo, and photographs of Oliver Cowdery's handwritten account of receiving the Aaronic Priesthood.

Contains diverse addresses given by Clark.

Materials include correspondence sent to Orson F. Whitney from John A. Widtsoe, an apostle of The Church of Jesus Christ of Latter-day Saints. Widtsoe compliments Whitney on his series of books about Utah history, his book "Saturday Evening Thoughts", and his tract collection "The Way, The Truth, The Light". He also informs him that his only son will be serving in the British Mission while Whitney is the mission president there. Dated 1916-1930.

Materials include originals and transcriptions of correspondence between Orson F. Whitney and apostles David O. McKay, Heber M. Wells, John A. Widstoe, Horace G. Whitney, and Levi Edgar Young about matters relating to The Church of Jesus Christ of Latter-day Saints. Dated 1882-1930.