I am trying to study the Septuagint and its work on or within the biblical Canon. I understand that the first Bible was the Septuagint. I believe that under Christian supervision, the Septuagint divided the minor prophets from other books and added additional works that Protestants, Jews, and Catholics refer to as apocrypha and deuterocanonical, respectively. The Jews who finalized the Hebrew OT text rejected many of the Deuterocanonical books because they appeared to have been written in Greek at first. However, it's possible that those Jews originated in first-century Jerusalem. However, the Hebrew texts discovered in Alexandra prior to 285 BC may have contained the Deuterocanonical books discovered in the LXX. With the exception of the Maccabees, which had to be written after the events,
I have read the following:
Beckwith, Roger. The Old Testament Canon of the New Testament Church. London: SPCK, 1985
McDonald, Lee Martin. The Biblical Canon: Its Origin, Transmission, and Authority. Grand Rapids: Hendrickson Publishers, 2011.