Collection includes correspondence with Isabella Barclay, Peter Skene Ogden and others; deeds; receipts; and documents relating to the Oregon City School.

Collection consists of a typescript, "Captain Nathaniel J. Wyeth's Journey up the Deschutes River in 1834-35," 7 pages, undated, regarding the plotting of a trail that differs from that of the Ralph Shane maps. Also included is a typescript letter to Thomas Vaughan, January 31, 1971, regarding corrections in plotting Peter Skene Ogden's 1824-1826 expeditions in Snake Country.

James H. McMillen (1823-1913) was an Oregon pioneer of 1845, volunteer in the Cayuse Indian war, and resident of Washington County, Oregon. Collection consists of McMillen's manuscript reminiscences, 1910-1911, in the form of a letter to George Himes, regarding his journey to Oregon in 1845; his acquaintance with John McLoughlin and Peter Skene Ogden; and his recollections of the Whitman killings, Cayuse Indian War, and early Portland, Oregon.

Ink portraits of famous Oregon pioneers, including George Abernathy, Jonathan Bourne, Robert Gray, Joseph Lane, John McLoughlin, Joe Meek, Peter Skene Ogden, Oswald West, John Whiteaker, Narcissa Whitman, W. S. U'Ren and Jason Lee, and Oregon pioneer archetypes, such as a trapper and farmer.