Richard Bushman's discussion of the Book of Mormon in Joseph Smith and the Beginnings of Mormonism was really good. Surprisingly, his discussion of the Book of Mormon in Rough Stone Rolling was as weak as the one in Joseph Smith and the Beginnings of Mormonism was strong.
Now, however, there is something better. The best discussion of the coming forth of the Book of Mormon is now Michael MacKay and Gerrit Dirkmaat's From Darkness unto Light published this year. If you are reading Rough Stone Rolling, skip the section on the Book of Mormon and read this instead. (Skip what Bushman says about the Book of Abraham too.)
If you think you know how the Book of Mormon was translated, you should read MacKay and Dirkmaat because you find out all kinds of things that you did not know.