The bulk of the collection includes letters addressed to John Greenleaf Whittier and to Samuel Thomas Pickard, and correspondence grouped under "Other letters" carried on between relatives and friends of Whittier's and Pickard's. Correspondents include: Mary Abigail Dodge, Annie Fields, Sarah Orne Jewett, Thomas Star King, Mary Todd Lincoln, Bliss Perry, Benjamin Perley Poore, Charles Sumner, Celia Thaxter, and J. T. (John Townsend) Trowbridge. There are significant collections of letters from Lucy Larcom and to Elizabeth (Hussey) Whittier, the poet's sister. The rest of the material includes typescript and manuscript copies by Samuel Thomas Pickard of Whittier's letters and poems. Pickard had sold many of Whittier's autograph letters and manuscripts in order to raise funds to preserve the poet's home in Amesbury. Finally there is a small collection of autograph manuscripts by Lucy Larcom and others which includes poems dedicated to Whittier and essays in the form of letters. The miscellaneous material contains notes and drafts by Pickard in relation to his biography of Whittier and printed ephemera.