Series III contains a disparate group of Walpole-related texts and visual materials ranging from a 1716 receipt for tonnage signed by Horatio Walpole of Wolterton to a 1903 prospectus for Mrs. Paget Toynbee's edition of The Letters of Horace Walpole. There is a print view of "The Castle of Otranto," one of the monument to King Theodore erected by Horace Walpole at St. Ann Westminster, and text pages removed from different editions of The Letters of Horace Walpole. Also in the series is a 1792 manuscript note sent from Horace Walpole to Joseph Cooper Walker; its content was published in volume 42, page 384 of The Yale Edition of Horace Walpole's Correspondence (New Haven: 1980) based on an 1885 edition of his letters, but the manuscript itself had been untraced since 1905.