The papers consist of correspondence, writings, manuscript notes, and printed material documenting the life of Harriet Martineau. Among the noteworthy correspondents are Matthew Arnold, Florence Nightingale, Elizabeth Gaskell, Charlotte Bronte, Harriet Beecher Stowe, Samuel Courtauld, W. E. Gladstone, Robert Graves, Samuel Lucas, Lord John Russell, Maria Weston Chapman, and Henry William Wilberforce.