What is the the plural of Book of Mormon? Not as in if there were more than one book of Mormon (i.e. 1 Ne., 2 Ne...). But as in the actual book that contains all of the other books.
I think that is would be Book of Mormons. Whereas Books of Mormon would be like saying Books of Nephi (i.e. 1 Ne., 2 Ne...). If you get the picture.