Silas LeRoy Richards' journal includes a pamphlet that shares the Spaulding theory.
"Catechism for Mormonism," in Silas LeRoy Richards missionary journal, 1907, BYU Harold B. Lee Library
Q. What did he do that was so bad? A. He was noted as a thief and liar. He was arrested and imprisoned for theft and larcency, and he was a great falsifier. He claimed to work miracles, but was shown to have have deceived the people: He claimed to have dis- covered golden plates containing the Book of Mormon, and it has been established that the book was written as a romance, by Solomon Spaulding He claimed to read and translate the book by the means of two stones, and he was caught in the act of reading it from the old manuscript of Solomon Spaulding.