The William P. Pinkham Papers consists of material relating to the life of William Penn Pinkham, a prominent Gurneyite Quaker minister and educator in Ohio, Indiana, and California. The Pinkham Collection consists of two typescripts of an unpublished autobiography, "God's Voice to Me," along with one copy of his 1899 book, The Lamb of God; or, Scriptural Philosophy of the Atonement,  and an annotated copy of Charles N. Sinnett's Richard Pinkham of Old Dover, New Hampshire, and His Descendants (1908).