To that end, Larson carefully examined the Original Manuscript (the one dictated by Joseph Smith to his scribes) and the Printer’s Manuscript (the copy Oliver Cowdery prepared for the Printer in 1829–1830), and compared them with the 1st, 2nd, and 3rd editions of the Book of Mormon to determine what sort of changes had occurred over time and to make judgments as to which readings were the most original.
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