The Changing World of Mormonism--chapter 7
http://www.utlm.org/onlinebooks/changech7.htm#183
". . .Serious Changes
As we pointed out in another chapter, the Mormons claim that a voice from heaven told the witnesses to the Book of Mormon that the translation was correct. In spite of this Joseph Smith tried to change the Book of Mormon to support his concept of a plurality of Gods. Four important changes were made in the second edition of the Book of Mormon concerning the Godhead.
One of the most significant changes was made in 1 Nephi 13:40. In the 1830 edition it was stated that the very purpose of the Nephite records was to make known that Christ is the Eternal Father: "... These last records, ... shall make known to all kindreds, tongues, and people, that the Lamb of God is the Eternal Father and the Savior of the world ..." (Book of Mormon, 1830 ed., p. 32).
In the current Utah edition, page 25, verse 40, three words have been interpolated: "... These last records, ... shall make known to all kindreds, tongues, and people, that the Lamb of God is the Son of the Eternal Father, and the Savior of the world...."
A second important change was made in 1 Nephi 11:18; this is page 25 of the 1830 edition.
In the first edition it read: "... Behold, the virgin which thou seest, is the mother of God, after the manner of the flesh." In modern editions it has been changed to read: "... Behold, the virgin whom thou seest is the mother of the Son of God, after the manner of the flesh." Notice that the words "the Son of" have been inserted in the middle of the sentence. Verse 21 of the same chapter originally read: "And the angel said unto me, behold the Lamb of God, yea, even the Eternal Father!" It was changed to read: "And the angel said unto me: Behold the Lamb of God, yea, even the Son of the Eternal Father!" Verse 32 of the same chapter, which is on page 26 of the original edition, was also changed. In the 1830 edition it read: "... the Everlasting God, was judged of the world; and I saw and bear record." It was changed to read: "... the Son of the everlasting God was judged of the world: and I saw and bear record." These additions begin to distinguish the Son from the Father and are part of the process that ultimately led Joseph Smith to declare the Father and the Son as two separate gods. . ."