During the Reformation, primarily for doctrinal reasons, Protestants removed seven books from the Old Testament: 1 and 2 Maccabees, Sirach, Wisdom, Baruch, Tobit, and Judith, and parts of two others, Daniel and Esther. They did so even though these books had been regarded as canonical since the beginning of Church history.
At Catholic Answers we are often asked which Bible version a person should choose. This is an important question about which Catholics need to be informed. Some have been given very little help about how to pick a Bible translation, but keeping in mind a few tips will make the decision much easier.