This is a synthetic collection that includes manuscripts, correspondence, an undated commonplace book, and an undated notebook. The manuscripts consist of holograph poems and portions of novels. The correspondence includes letters from the author, dating from  to 1839, to Joseph Cottle, John Abraham Heraud, Edward Moxon, Edith Fricker Southey, and others. Also present are letters relating to the author, dating from ca. 1816 to 1959, between various correspondents including Richard Brudenell Exton, Charles Southey, W. H. Somerton, Caroline Southey, Lord Ashley, earl of Shaftesbury, and others. There are letters to Southey from Joanna Baillie, George Howland Beaumont, George Canning, A. Anderson Feldborg, Samuel Carter Hall, Benjamin Robert Haydon, William Hayley, Charles Lamb, Walter Savage Landor, Robert Sheldon MacKenzie, Sir Walter Scott, Lord Ashley, earl of Shaftesbury, Caroline Bowles Southey, William Wordsworth, and others, dating from  to 1839.