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Handwritten letter from H M Richmond to Isaac ? Post, March 3, 1872.
Handwritten letter from Edmund P Willis to Isaac ? Post, 1872?
Handwritten letter from Jacob Kirby Post to Isaac ? Post, 1872?
Handwritten letter from Mary C Wight to Isaac ? Post, August 21, 1870.
Handwritten letter from John Q Howe to Isaac ? Post, March 13, 1869.
Handwritten letter from Cora L V Daniels to Isaac ? Post, January 24, 1867.
Handwritten letter from Edward Wheeler to Isaac ? Post, December 26, 1864.
Handwritten letter from Mary Robbi Ns Post to Isaac ? Post, 186-?
Handwritten letter from Libbie ? Higgins to Isaac ? Post, November 16, 1858.
Handwritten letter from Matilda Anthony to Isaac ? Post, January 8, 1858.
Spirit Writing to Isaac ? Post, June 30, 1856?
Handwritten letter from Mary Robbins Post to Isaac ? Post, 1856?
Handwritten letter from Mary Jane ? Post to Isaac ? Post, September 25, 1854.
Handwritten letter from Jeffries Hallowell to Isaac ? Post, 1838?
Handwritten letter from Willet E Post to Isaac ? Post, n.d.
Handwritten letter from Willet E Post to Isaac ? Post, n.d.
Handwritten letter from Mary Robbins Post to Isaac ? Post, n.d.
Handwritten letter from Andrew Jackson Davis to Isaac ? Post, n.d.
Handwritten letter from unknown writer to Isaac ? Post, n.d.