Calvin O'Keefe is a major character in Madeleine L'Engle's Time Quartet series of books, and, as "Dr. Calvin O'Keefe", an important character in her O'Keefe series of young adult novels.
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Many Waters (1986, ISBN 0-374-34796-4) — The third book in the series chronologically, the last title to be published in the original Time Quartet focuses on different characters.
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