This sub-series contains the correspondence between Frank and Sarah, their children, and with other Baker family members. A small collection of Sarah's poetry is included, as are her reminences of attending Whitman Seminary and her "Pioneer Child: The Memoirs of Sarah Ann Baker," which was edited and prefaced by one of her daughters, Helen Baker Reynolds. Also found here is Nan Reynolds Sparrow's compliation of Frank's and Sarah's family letters in her "Excerpts from E.F. Baker Family Letters."