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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 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 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 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