Is the Book of revelations contained in the catholic bible?

Considering taking steps to confirmation in the catholic faith and this question has always been a one that has concerned me. Is the Book of Revelations on the Catholic bible and if not, why not?

Yes, the Book of Revelation (sometimes called the Book of Apocalypse) is part of the Catholic Bible.

Catholic Encyclopedia entry:
Apocalypse: The last book in the Bible, the Book of Revelation

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