One thing that seems interesting to me is that the Roman Catholic and Protestant NT both contain the same books. When it comes to the OT there are some books called apocrypha which are accepted by Roman Catholics and some others but not by most Protestants. The original King James Version included apocryphal books but many modern versions of the KJV do not. So much for those who are so strongly for the 1611 KJV.
There is a short book called "The Didache" or "teaching" which has differences of opinion on its date of origin. Some place it back in the days of the Apostles and others say it could date from a couple centuries later. This book mentions the Father, Son, and Holy Ghost formula for baptism and baptism by three immersions in running water. There is a version of the Bible called the AESV (Aramaic English Standard Version) which includes the "Didache" also called the "Limuda" and includes it in
Acts 15:25-29.