FAIR is a non-profit organization dedicated to providing well-documented answers to criticisms of the doctrine, practice, and history of The Church of Jesus Christ of Latter-day Saints.
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Kendel J. Christensen, Roger D. Cook, and David L. Paulsen, "The Harrowing of Hell: Salvation for the Dead in Early Christianity," Journal of the Book of Mormon and Restoration Scripture 19/1 (2010): 56–77. off-site wiki