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Terry Scott, a young archaeology professor, seeks Nancy's help in unearthing a secret of antiquity which can be unlocked by three black keys. While on an archaeological expedition in Mexico, terry and Dr. Joshua Pitt came across a clue to the buried treasure. The clue was a cipher carved on a... read more
This is book 28 in the Nancy Drew Mystery Stories series.
List the books that contain additional information about this book.
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