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- [Letter from Geo. M. Searle to Lysander Spooner]
- Undated letter from Geo. [George] Searle to Lysander Spooner dated 23 Feb. [...?] stating that he had "addressed a line to R. [Reverdy] Johnson."
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- [Letter from A. P. Aldrich to Lysander Spooner]
- Undated one-page letter labeled "Private" from A. P. Aldrich to Lysander Spooner [of Boston, Massachusetts], asking for his legal opinions on case Ogden vs. Saunders and offering his observations on the "[] and the disposition of the Southern people."
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- [Manuscript copy of a letter from Thomas Earle to G. Braburn, Esq.]
- Manuscript copy in Lysander Spooner's hand of a four-page letter dated April 12, 1845, from Thomas Earle in Philadelphia [Pennsylvania] to G. [George] Bradburn, in which he gives lengthy critique of Lysander Spooner's book [probably The Unconstitutionality of Slavery] and the abolitionist movement in general.
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- [Letter from James Birney to Lysander Spooner, Esq.]
- One-page letter dated August 18, 1853, from James Birney of Cincinnati [Ohio] to Lysander Spooner [of Boston, Massachusetts], asking for his legal opinion on the decision of Judge [John] McLean on the [Rosetta Armstead] fugitive slave case.
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- [Letter from G. Bradburn to Lysander Spooner]
- Four-page letter dated October 26, 1845, from G. [George] Bradburn in Boston [Massachusetts] to Lysander Spooner in Athol, Massachusetts, discussing opinions about Spooner's book, The Unconstitutionality of Slavery, and plans to begin a "Review" in Boston.
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- [Letter from Lysander Spooner to George Bradburn]
- Four-page letter dated October 27, 1846, from Lysander Spooner in Boston [Massachusetts] to George Bradburn in Cleveland, Ohio, regarding the death of "Rogers" and the reactions of various prominent abolitionists, including William Lloyd Garrison and Edmund Quincy.
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- [Letter from L. Spooner to Bradburn]
- One-page letter dated July 18, 1848, from L. [Lysander] Spooner in Boston [Massachusetts] to [George] Bradburn, notifying that he is leaving Boston for Athol because he has "nothing to eat" and that "the Abolitionists must flounder in their ignorance until they are willing to give me bread in exchange for knowledge."
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- [Letter from Elizur Wright to Lysander Spooner]
- Letter from Elizur Wright in Boston, Massachusetts, to Lysander Spooner dated April 10, 1866, discussing topics of anti-slavery.
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- [Letter from A. P. Aldrich to Lysander Spooner]
- Five-page letter dated August 20, 1866, from A. P. Aldrich in Barnwell, South Carolina, to Lysander Spooner [of Boston, Massachusetts] regarding the economic hardships faced by the South during the reconstruction era.
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- [Letter from S. P. Andrews to Lysander Sponer, Esq.]
- One-page letter dated December 28, 1850, from Stephen P. Andrews in New York City, to Lysander Spooner of Boston [Massachusetts], reporting on the distribution of books sent by Spooner to Freeman Hunt, [William Cullen] Bryant, [Horace] Greeley, and Park [Parke] Godwin. Includes mention of a "card" [possibly a petition] that Andrews suggests having signed in Boston and then sent to New York for additional singatures.
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- [Letter from Stephen P. Andrews to Lysander Spooner]
- One-page letter dated December 13, 1850, from Stephen P. Andrews in New York City, to Lysander Spooner of Boston, Massachusetts, arranging an agreement for Andrews to promote the views of Spooner and other Boston abolitionists in exchange for an allowance of funds.
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- [Letter from Lewis Tappan to Lysander Spooner]
- Two-page letter from Lewis Tappan in Rochester [New York] to Lysander Spooner dated August 22, 1852, discussing Spooner's writings.
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- [Letter from L. Spooner to Bradburn]
- Two-page letter dated January 19, 1848, from L. [Lysander] Spooner in Boston [Massachusetts] to George Bradburn, regarding various abolitionist publications and a "misunderstanding" between Bradburn and Clapp.
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- [Letter from J. R. Giddings to Lysander Spooner]
- One-page letter from J. R. [Joshua Reed] Giddings in Washington [D.C.] to Lysander Spooner dated January 1, 1852, praising him for his work, Trial By Jury. This letter is part of the Misc. Mass. Giddings, Joshua R. collection in the New-York Historical Society.
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- [Letter from Wm. Brackett to Lysander Spooner, Esq.]
- One-page letter dated April 26, 1878, from Wm. [William] Brackett in Chicago [Illinois] to Lysander Spooner [of Boston, Massachusetts], asking for for his opinion on Herbert Spencer's "Unknowable" speech and advisement on the publication of a new essay.
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- [Letter from Geo. Bradburn to Lysander Spooner]
- Undated one-page note from Geo. [George] Bradburn [in Boston, Massachusetts] to Lysander Spooner [also of Boston], explaining that he has been unable to call, but welcomes Spooner to call on him.
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- [Letter from L. Spooner to George Bradburn]
- Two-page letter dated June 1, 1847, from L. [Lysander] Spooner in Boston [Massachusetts] to George Bradburn, regarding articles written by [Gamaliel] Bailey and [Wendell] Phillips, and Spooner's responses to them. Also mentions news of Mrs. [Elizabeth] Sargeant.
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- [Letter from L. Spooner to George Bradburn]
- Four-page letter dated August 25, 1847, from L. [Lysander] Spooner in Boston [Massachusetts] to George Bradburn in Cleveland, Ohio, instructing on where to send letters to Mrs. [Elizabeth] Sargeant, and to pick up a letter from her friend, Miss Julia Johnson. Also discusses abolitionist activities and arguments appearing in Spooner's new book.
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- [Letter from Lysander Spooner to George Bradburn]
- Four-page letter dated December 26, 1845, from Lysander Spooner in Athol [Massachusetts] to George Bradburn in Boston [Massachusetts], expressing desire to distribute his book [The Unconstitutionality of Slavery] to members of the United States Supreme Court and discussing other opinions on the state of the abolitionist movement.
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- [Two letters from Lysander Spooner to George Bradburn]
- Two letters from Lysander Spooner to George Bradburn. A two-page note dated June 21, 1845, notifying that Amasa Walker will be visiting the store of Emerson, Harris & Potter if Bradburn would like to see him. Followed by a one-page letter dated October 17, 1845, notifying that he must leave Boston to attend to his mother in Athol [Massachusetts].
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- [Letter from G. Bradburn to Lysander Spooner]
- Six-page letter dated January 7, 1846, from G. [George] Bradburn in Boston [Massachusetts] to Lysander Spooner in Athol, Massachusetts, discussing [Samuel E.] Sewall's criticisms of Spooner's work and also mentioning the acceptance by [Charles?] Allen and "Williams" of Spooner's petition.
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- [Letter from L. Spooner to George Bradburn]
- Two-page letter dated May 1, 1846, from L. [Lysander] Spooner in Boston [Massachusetts] to [George] Bradburn discussing the separation of Elizabeth Sargeant from her husband and mentions acquiring a publisher for the first part of his book.
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- [Letter to Lysander Spooner]
- Unsigned letter to Lysander Spooner in Boston, Massachusetts dated September 22, 1853, possible in the hand of George Bradburn, discussing travel to New York and Boston.
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- [Letter from Geo. Bradburn to Lysander Spooner]
- Four-page letter dated September 8, 1845, from Geo. [George] Bradburn in Bangor [Maine] to Lysander Spooner of Boston, Massachusetts, describing several newspaper and circular reviews of Spooner's book [The Unconstitutionality of Slavery], mentioning opinions given by [William Lloyd] Garrison and Bob [Robert?] Phillips.
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- [Letter from Lysander Spooner to Bradburn]
- Four-page letter dated October 27, 1845, from Lysander Spooner in Athol [Massachusetts] to George Bradburn in Boston, discussing Supreme Court decisions related to slavery, the death of Spooner's mother, and the public reception of his book [The Unconstitutionality of Slavery].
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- [Letter from L. Spooner to George Bradburn]
- Two-page letter dated July 15, 1846, from L. [Lysander] Spooner in Boston [Massachusetts] to George Bradburn in Lowell, Massachusetts, discussing Bradburn's reports on schools in Nantucket and a speech made by Fletcher Webster.
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- [Draft of letter from L. S. to Bradburn]
- Draft of two-page letter dated September 19, 1845, from L. S. [Lysander Spooner] of Boston [Massachusetts] to [George] Bradburn notifying him of the sale of the Boston Chronicle to Hiram Cummings, and encouraging him to "start a paper" in Boston with the backing of Richard Hildreth.
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- [Letter from L. Spooner to George Bradburn]
- Four-page letter dated March 5, 1846, from Lysander Spooner in Athol [Massachusetts] to George Bradburn in Boston, responding to cirticisms of his book [The Unconstitutionality of Slavery] and discussing the concept of "free banking" in the United States.
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- [Letter from Wm. Brackett to L. Spooner, Esq.]
- Three-page letter dated April 22, 1861, from Wm. [William] Brackett in Chicago [Illinois], to Lysander Spooner [of Boston, Massachusetts], giving his opinion of several pamphlets by Spooner and the political mood of Chicago.
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- [Letter from L. S. to Bradburn]
- Two-page letter dated 1845, from L. S. [Lysander Spooner] of Boston [Massachusetts] to [George] Bradburn notifying him of the sale of the Boston Chronicle to Hiram Cummings, and encouraging him to "start a paper" in Boston with the backing of Richard Hildreth.
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- [Letter from Geo. Bradburn to Lysander Spooner]
- Four-page letter dated May 5, 1846, from Geo. [George] Bradburn in Nantucket [Massachusetts] to Lysander Spooner in Boston [Massachusetts] addressing rumors of Mrs. [Elizabeth] Sargeant and discussing the Whigs "on occasion of [Edward] Everett's inauguration."
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- [Letter from Geo. Bradburn to Lysander Spooner]
- Four-page letter dated October 19, 1845, from Geo. [George] Bradburn in Boston [Massachusetts] and Lysander Spooner in Athol, Massachusetts, discussing the cases of Prigg vs. Penn and George Latimer.
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- [Letter from L. Spooner to George Bradburn]
- Four-page letter dated January 4, 1848, from L. [Lysander] Spooner in Boston [Massachusetts] to George Bradburn in Cleveland, Ohio, discussing Bradburn's editorial position at the paper [The Pioneer] and other abolitionist news.
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- [Letter from G. Bradburn to Lysander Spooner]
- Four-page letter and envelope dated January 1, 1845 [1846] from G. [George] Bradburn in Boston [Massachusetts] to Lysander Spooner, apologizing for not visiting him in Athol [Massachusetts] and discussing various activities of the Whig Party.