Because of the promise that extra scripture would be forthcoming in 2 Nephi 29, Latter-day Saints sometimes cast about for additional scripture. I have dealt with some of the places that they search elsewhere, but sometimes instead of far off locations, they need only look closer to home.
The Septuagint version of Ezra has an extra chapter at the beginning of the text that is not in the Hebrew Bible. It is a historical overview that covers from Josiah through the Babylonian captivity.
Of course, the sections that are in the Septuagint that are not in the Hebrew Bible are usually called the apocrypha so I suppose that D&C 91 applies to the first chapter of Esdras in the Septuagint too.
