Mary W. Irvine claims that her father told her that Sidney Rigdon had the Spaulding manuscript.
Arthur B. Deming, "Letter from Mary W. Irvine, November 11, 1887," Naked Truths about Mormonism 1, no. 1 (January 1888)
504 North Highland Ave.,
E. E., Pittsburgh, Pa.
Nov. 11, 1887.
Mr. A. B. Deming-Sir: Your letter of November I received two days since. My father left no papers on the subject, but I distinctly recollect his saying that Sidney Rigdon showed him the Spaulding Manuscript as a literary curiosity left in the office to be published if it was thought it would pay. When father say the "Book of Mormon' he said it was Rigdon's work, or he had a hand in it; I do not remember his words entirely, so many years have elapsed, but that was the import.
Respectfully,
Mary W. Irvine.