Alma 37:3

and these plates of brass which contain these engravings, which have the records of the Holy Scriptures upon them, which have the genealogy of our forefathers, even from the beginning.

These brass plates have writings on them. They have the Holy Scriptures on them. They have the family history of our ancestors from the very beginning.

These plates of brass contain engravings—the records of the Holy Scriptures and the genealogy of our ancestors, going all the way back to the beginning.