The Hallowell family papers, 1856-1891, consists of letters written to William Hallowell, his wife Mary (Post) Hallowell, and Mary's aunt Sarah (Kirby) Hallowell Willis. The letters mainly discuss personal affairs; many are letters of condolence after the death of William Hallowell in 1882.

This two-volume extra-illustrated version of The Life and Work of Susan B. Anthony contains 38 tipped-in letters and autographs inserted into the book by its author, Ida Husted Harper. She placed them into the book at the appropriate point in the narrative. The material covers the bulk of Anthony's working life. 19 of the letters are addressed to Anthony, and another 3 to Elizabeth Cady Stanton. The letters were evidently in the possession of Harper, who had access to Anthony's correspondence while writing the biography.

The collection consists of letters written by and to Isabella Beecher Hooker (1822-1907) and her husband John Hooker (1816-1901). Included are almost daily reports from Isabella Beecher Hooker to her husband written from Washington, DC where, on January 12, 1872, she and Susan B. Anthony testified on behalf of a federal woman suffrage amendment before a hearing of the Senate Judiciary Committee.