To Levett Harris, 21 June 1820 (letter not found)
¶ To Levett Harris. Letter not found. 21 June 1820. Offered for sale in John Heise Autographs, Catalogue A (1921), item 26. This letter was probably the one listed for sale in Stan. V. Henkels Catalogue No. 836 (2 Feb. 1900), item 4, as to an unidentified correspondent.