- Manuscript draft of a two-page letter from Lysander Spooner in Boston [Massachusetts] to Gerrit Smith in Peterboro, New York, dated July 3, 1848, in which Spooner asks for the return of the copyrights to his works so that he might raise funds against it for the publication of his newest book., New-York Historical Society
- Four-page letter from Lysander Spooner in Boston [Massachusetts] to Gerrit Smith in Peterboro, New York, dated July 3, 1848, in which Spooner asks for the return of the copyrights to his works so that he might raise funds against them for the publication of his newest book., New-York Historical Society