The Llewelyn Riggs McKay papers (1911-1960) contain correspondence, newspaper clippings, reports and articles. Of special note is a bound volume consisting of a typescript of McKay's missionary journal and correspondence, complied and edited by his children, Douglas R. McKay and Bonnie M. Nelson. This collection also includes many original letters between the McKay family throughout McKay's schooling, teaching and army service.

Llewelyn Riggs McKay (1904-1975) was a professor at the University of Utah who served as head of the Language Department from 1945 until 1965. His father, David O. McKay, was the ninth president of the Church of Jesus Christ of Latter-Day Saints. This collection contains portraits of Llewelyn McKay, David O. McKay, and photographs of the McKay family. It also contains photographs documenting the mission that Llewelyn McKay served in Germany between 1922 and 1925.