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- [Draft of letter from Lysander Spooner to George Bradburn]
- Manuscript draft of a four-page letter dated January 19, 1846, from Lysander Spooner in Athol [Massachusetts] to George Bradburn in Boston [Massachusetts], asking Bradburn to solicit prominent names to sign a petition and then have the petition presented to the United States legislature., New-York Historical Society
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- [Letter from Lysander Spooner to George Bradburn]
- Four-page letter dated January 19, 1846, from Lysander Spooner in Athol [Massachusetts] to George Bradburn in Boston [Massachusetts], asking Bradburn to solicit prominent names to sign a petition and then have the petition presented to the United States legislature., New-York Historical Society
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- [Letter from Gerrit Smith to Lysander Spooner]
- Two-page letter from Gerrit Smith of Peterboro [New York] to Lysander Spooner in Boston, Massachusetts, dated November 12, 1847, in which Smith pledges funds to support Spooner as he writes his newest book and discusses an anti-slavery convention in Buffalo [New York]., New-York Historical Society
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- [Letter from Gerrit Smith to Lysander Spooner]
- Two-page letter from Gerrit Smith of Peterboro [New York] to Lysander Spooner in Boston, Massachusetts, dated December 4, 1847, regarding copies of Spooner's petition to Congress that Smith has forwarded on to Elizur Wright., New-York Historical Society
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- [Letter from Lysander Spooner to Gerrit Smith]
- Eight-page letter from Lysander Spooner in Worcester [Massachusetts] to Gerrit Smith, dated July 5, 1849, describing his analysis of the United States Constitution with regards to slavery., New-York Historical Society
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- [Manuscript draft of a letter from Lysander Spooner to Gerrit Smith]
- Manuscript draft of an eight-page letter from Lysander Spooner in Worcester [Massachusetts] to Gerrit Smith, dated July 5, 1849, describing his analysis of the United States Constitution in regards to slavery., New-York Historical Society
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- [Letter from Bela Marsh to Gerrit Smith and manuscript copy of Smith's reply]
- Two-page letter from Bela Marsh in Boston, Massachusetts to Gerrit Smith, dated September 29, 1849, regarding a resolution to distribute Lysander Spooner's work, the Unconstitutionality of Slavery to lawyers. At end, manuscript copy of Smith's response, dated October 7, 1849, in Smith's hand., New-York Historical Society
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- [Letter and envelope from Bela Marsh to Lysander Spooner]
- One-page letter and envelope from Bela Marsh in Boston [Massachusetts] to Lysander Spooner in Worcester [Massachusetts], dated October 11, 1849, in which he forwards a transcription of Gerrit Smith's reply to Marsh's inquiry about distributing Spooner's book to United States lawyers., New-York Historical Society
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- [Letter from John A. Reed to Lysander Spooner]
- Two-page letter from John A. Reed in Mount Vernon, Ohio, to Lysander Spooner dated July 2, 1851, asking Spooner to send the names and P.O. addresses of "those members of your Legislature who voted for Hon. Chas. [Charles] Sumner [?].", New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- One-page letter dated January 5, 1855, from William Goodell on behalf of the American Abolition Society in New York, to Lysander Spooner in Boston, Massachusetts, ordering a supply of his book, The Unconstitutionality of Slavery, for distribution to all members of Congress, as well as additional copies to sell and give away., New-York Historical Society
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- [Letter from Lysander Spooner to Gerrit Smith]
- Four-page letter from Lysander Spooner in Boston [Massachusetts] to Gerrit Smith, dated November 2, 1855, in which Spooner disucsses anti-slavery arguments and the distribution of 300 copies of his book, "the Unconstitutionality of Slavery.", New-York Historical Society
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- [Letter from Gerrit Smith to Lysander Spooner]
- Two-page letter from Gerrit Smith in Peterboro [New York] to Lysander Spooner in Boston, Massachusetts, dated November 6, 1855, in which he expresses his pleasure that Spooner is writing an argument "on the Wilhelm case" and discusses the distribution of 300 copies of Spooner's book, "the Unconstitutionality of Slavery.", New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated November 28, 1855, from William Goodell in New York, to Lysander Spooner [in Boston, Massachusetts], in which he approves of Spooner's plan to "agitate the Constitutional question.", New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated December 1, 1855, from William Goodell in New York, to Lysander Spooner [in Boston, Massachusetts], discussing the legalization of slavery., New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated December 3, 1855, from William Goodell in New York, to Lysander Spooner [in Boston, Massachusetts], discussing constitutional issues of slavery and Spooner's work., New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- One-page letter dated December 18, 1855, from William Goodell in New York, to Lysander Spooner in Boston [Massachusetts], giving his approval of Spooner's "form of a letter to be forwarded to Congress, with the form of petition.", New-York Historical Society
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- [Manuscript copy of a letter from Gerrit Smith to Hon. D. Wilmot]
- Manuscript copy of a four-page letter from Gerrit Smith of Peterboro [New York] to Hon. D. [David] Wilmot, dated March 20, 1856, in which he responds to a letter from Wilmot discussing slavery and the United States Constitution, and sends him a copy of Lysander Spooner's "the Unconstitutionality of Slavery.", New-York Historical Society
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- [Letter from Gerrit Smith to Lysander Spooner]
- One-page letter from Gerrit Smith of Peterboro [New York] to Lysander Spooner dated March 20, 1856, to notify Spooner that he has "got said Wilhelm himself to [?] the Constitution" and abolitionism., New-York Historical Society
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- [Letter and circular from Hez L. Hosmer to Spooner]
- One-page letter and envelope dated September 23, 1866, from Hez L. [Hezekiah Lord] Hosmer in Virginia City to Lysander Spooner [probably in Boston, Massachusetts] written on the back of a circular titled "Chief Justice H.L. Hosmer's Charge to the Grand Jury.", New-York Historical Society
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- [Pledge of money to Lysander Spooner]
- 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., New-York Historical Society