Resources on the Spaulding Theory of Book of Mormon Origins

The "Manuscript Story" of Reverend Solomon Spalding; or "Manuscript Found" The text itself

Lester E. Bush, The Spalding Theory: Now and Then

FairMormon Wiki Page on the Spalding Theory

Jeff Lindsay, Plagiarism in the Book of Mormon? Is it derived from Modern Writings?

Idem, That New Book of Mormon Wordprint Study: The Criddle Riddle--or Rigged for Rigdon?

Russell Anderson, The Spaulding Theory Debunked

Matthew B. Brown, Solomon Spaulding and the Book of Mormon

Dean C. Jessee, 'Spalding Theory' Re-Examined

Lance D. Chase, "Spaulding Manuscript" (Encyclopedia of Mormonism)

L. Ara Norwood's review of Vernal Holley, Book of Mormon Authorship: A Closer Look

Matthew Roper, “The Mythical "Manuscript Found" (review of Wayne L. Cowdery, Howard A. Davis, and Arthur Vanick, Who Really Wrote the Book of Mormon? The Spalding Enigma)

Idem, Myth, Memory, and "Manuscript Found"

Matthew Roper, Paul J. Fields, and G. Bruce Schaalje, Stylometric Analyses of the Book of Mormon: A Short History

Matthew Roper and Paul J. Fields, The Historical Case against Sidnney Rigdon's Authorship of the Book of Mormon

It should also be noted that one can refute the various theories and “spins” on the Spalding theory using just non-LDS and anti-LDS sources. For instance:

John Hamer, "The Spaulding Fable" (a spoof-piece that also highlights the inanity of the "missing mauscript" theory)

Sandra Tanner, The Solomon Spalding Theory

Dan Vogel Discusses the Spalding/Rigdon Theory (here, Dan Vogel systematically destroys the purported evidences for the different "spins" on this theory)