The collection contains some of Landor's correspondence with family members and friends, including holograph letters (1836-1864) to his brother Henry Eyres Landor, to his sister Elizabeth, and to his nieces Ellen and Kitty, as well as several letters to Lady Blessington, Leigh Hunt, and John Edmund Reade. There are also original letters by Matthew Arnold, Lady Blessington, Shirley Brooks, George Jacob Holyoake, and John Morley, and 20 letters (1865-70) by John Forster and his wife to Landor's niece on the subject of Forster's biography of Landor.

In addition, there are about 200 pages of letters to and from Landor (1795-1864), transcribed in 1930-1931 from the originals when they were in the possession of Rev. Rasleigh Edmund Hungerford Duke, a relation of Landor. Most are addressed to or from family members, and approximately half relate to Landor's brother Henry.

Further accessions include additional correspondence and manuscripts connected with his contribution to The Atlas newspaper. Correspondents include Landor's daughter, Lady Blessington, G. P. R. James, William Charles Macready, and Edward Moxon. Also included are transcripts of original letters (1797-1862) which, formerly in the possession of the firm of Walter T. Spencer of London, were lost when the ship carrying them sank on its war to Princeton, N.J., in December 1940.