Old Testament - Bible - Catholic Online
The canon oftheOldTestament, its manuscripts, editions and ancient versions are treated in the articles BIBLE; CANON OFTHE HOLY SCRIPTURES; CODEX ALEXANDRINUS, etc.; Hebrew bible; massorah; manuscripts ofthebible; versions ofthebible.
List of Bible Books - Books of the Old Testament and New Testament
The OldTestament is comprised of 39 books in the Protestant Bible. The Catholic Bible includes seven additional books within the OldTestament (Note: I have written an article on the difference between the Catholic and Protestant Bibles).