The Hardy Boys
222 books in seriesThe Tower Treasure Summary

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Book 50
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Book 51
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Book 52
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Book 53
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Book 54
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Book 55
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Book 56
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Book 57
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Book 58
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Book 59
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Book 60
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Book 61
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Book 62
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Book 63
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Book 64
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Book 65
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Book 66
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Book 67
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Book 68
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Book 69