I am almost 100% sure they use the Critical Text. The Douay Rheims (still the choice of many traditionalists) was from the Vulgate, and for a long time they maintained no translation could be made from anything from the Vulgate. DTK would be helpful on this topic.

The Douay-Rheims Bible

The Jerusalem Bible (1966)
The New Jerusalem Bible (1985)
New American Bible

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Chris Poe
Mandeville, LA

"There are the foolish fanatics always to be found in such a movement and always discrediting it--the lunatic fringe in all reform movements." Theodore Roosevelt