The order of books is not part of the deposit of faith, so as such, it’s a purely editorial decision. The RSV orders its Old Testament approximating that of the Vulgate, ending in 2 Maccabees. The NAB, from the looks of it, tried to group the books into their literary genres/categories: Pentateuch, History, Wisdom, and Prophetic, ending with Malachi.
Even an “ecumenical” edition with the Deuterocanonicals sandwiched between the Protocanonicals and the New Testament would be just fine.
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