- Three-page letter marked 'Confidential' to Lysander Spooner of Boston [Massachusetts] requesting his participation in an Executive Committee formed to advocate for the enlistment of blacks to fight in the Civil War. Signed by George L. Stearns on behalf of the Committee. This letter is part of the Slavery collection in New-York Historical Society.
- Undated pledge of moneys to be paid to Lysander Spooner for "a review of Judge Kane's late decision, that the U.S. Courts have no constitutional right to punish for contempt without trial by jury." Signed by several prominent abolitionists, including Ellis Gray Loring, Francis Jackson, and Samuel E. Sewall.
- Draft of a six-page letter dated December 7, 1846, in the hand of Lysander Spooner in Winchendon, Massachusetts, addressed to [George] Bradburn, discussing various news of the abolitionist movement, opinions on articles and letters written by Edmund Quincy, Wendell Phillips [and others] and the affections of Elizabeth Sargeant.