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- [Letter from Lysander Spooner to Gerrit Smith]
- Four-page letter from Lysander Spooner in Boston [Massachusetts] to Gerrit Smith in Peterboro [New York] dated November 6, 1847, in which Spooner offers copyright to his past books as financial security for a loan from Smith., New-York Historical Society
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- [Manuscript draft of a letter from Lysander Spooner to Gerrit Smith]
- 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
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- [Letter from Lysander Spooner to Gerrit Smith]
- 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
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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 July 8, 1848, discussing copyright of Spooner's "The Unconstitutionality of Slavery" and pledging to give money to support his work., New-York Historical Society
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- To Gerrit Smith. Not sent, except a part. See copy of a letter of March 30, 1850
- Manuscript draft of a letter from Lysander Spooner to Gerrit Smith, undated, in which Spooner accuses Smith of copyright infringement., New-York Historical Society
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- To Gerrit Smith. Not sent, except a part. See copy of letter of March 30 - 1850
- Manuscript draft of a four-page letter from Lysander Spooner in Worcester [Massachusetts] to Gerrit Smith, dated March, 1850, in which Spooner accuses Smith of copyright infringement., New-York Historical Society
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- [Manuscript draft of a letter from Lysander Spooner to Gerrit Smith]
- Manuscript draft of a two-page letter from Lysander Spooner in Worcester [Massachusetts] to Gerrit Smith, dated March 30, 1850, in which Spooner accuses Smith of copyright infringement., New-York Historical Society
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- [Letter and envelope from Gerrit Smith to Lysander Spooner]
- Four-page letter and envelope from Gerrit Smith in Peterboro [New York] to Lysander Spooner in Worcester [Massachusetts] dated April 2, 1850, in which Smith responds to Spooner's accusations of copyright infringement., New-York Historical Society
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- [Manuscript draft of a letter from Lysander Spooner to Gerrit Smith]
- Manuscript draft of a twelve-page letter from Lysander Spooner in Worcester [Massachusetts] to Gerrit Smith, dated April 23, 1850, in which Spooner discusses specific instances of copyright infringement committed by Smith in the publication of "Gerrit Smith's Constitutional Argument.", New-York Historical Society
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- [Letter from L. Spooner to Bradburn]
- Three-page letter dated April 15, 1853, from L. [Lysander] Spooner in Boston [Massachusetts] to [George] Bradburn, notifying him of the death of Ernest Hidlreth, the youngest child of Richard and Caroline Hildreth, as well as discussing Spooner's newest work on the "Law of Intellectual Property" and a controversy between Horace Mann and Wendell Phillips., New-York Historical Society
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- [Letter from Lysander Spooner to Mr. Goodell]
- Two-page letter dated December 27, 1853, from Lysander Spooner in Boston [Massachusetts] to Mr. [William] Goodell, discussing Goodell's published references to Spooner's work, and the accusation by Spooner of copyright infringement., New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated December 28, 1853, from William Goodell in New York, to Lysander Spooner, discussing Goodell's published references to Spooner's work, and the accusation by Spooner of copyright infringement., New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated January 3, 1854, from William Goodell in New York, to Lysander Spooner, in which he defends his use of references to Spooner's work., New-York Historical Society
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- [Letter from Lysander Spooner to Mr. Goodell]
- Three-page letter dated January 5, 1854, from Lysander Spooner in Boston [Massachusetts] to Mr. [William] Goodell, discussing Goodell's published references to Spooner's work, and the accusation by Spooner of copyright infringement., New-York Historical Society
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- [Letter from Wm. Goodell to Lysander Spooner]
- Four-page letter dated January 18, 1854, from William Goodell in New York, to Lysander Spooner [in Boston, Massachusetts], discussing Goodell's published references to Spooner's work, and the accusation by Spooner of copyright infringement., New-York Historical Society
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- [Letter from L. Spooner to Bradburn]
- Two-page letter dated April 21, 1855, from L. [Lysander] Spooner in Boston [Massachusetts] to [George] Bradburn, discussing the completion of his newest book [probably on intellectual property law] and giving news of Sarah Hoyt's move to Wisconsin., New-York Historical Society
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- [Letter from W.G. to Lysander Spooner]
- Two-page letter dated November 1, 1864, from William Goodell in New York, to Lysander Spooner, explaining the origins of a quote that he used in a published article., New-York Historical Society