The papers of Clifford M. Drury include correspondence, research files, newspaper clippings, photographs, and manuscripts, from 1922- 1984, specifically regarding his works on Marcus Whitman and other early Pacific Northwest missionaries. Clifford Merrill Drury had a noteworthy career as a pastor, seminary professor, historian, and Navy chaplain.

The Lapwai Mission Press was the first printing press in the Pacific Northwest. The collection contains images, photocopies and facsimiles of publications, translation notes, and correspondence. The materials date from circa 1836 to 1993.

The Spalding Family Collection, which dates from 1832 to 1997, primarily holds the personal correspondence and writings of Protestant missionary Henry Harmon Spalding to the Oregon Territory during the nineteenth century. It also includes materials related to Eliza Hart Spalding, Rachel Smith Spalding, and Henry Hart Spalding.

The Walker Family Papers contain correspondence, a translation, and letters. These papers, which date from 1846 through 1957, also contain biographical and diary accounts, obituaries, and memorial brochures.