The Taylor Caldwell reference article from the English Wikipedia on 24-Apr-2004
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Taylor Caldwell

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Janet Miriam Holland Taylor Caldwell (September 7, 1900 - August 30, 1985) was a prolific and best-selling American author.

Works of note include:

It's said that she wrote Romance of Atlantis when she was twelve (please verify; a review on Amazon says thirteen). After she became an established author, the story was published, with co-writing credits to "Jess Stearn".