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7 of 7 books- en
The Mystery Boys and the Secret of the Golden Sun
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The Haunted Hangar Sky Scouts/Air Mystery series #3
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The Mystery Crash Sky Scout Series, #1
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The Mystery Boys and Captain Kidd's Message
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The Mystery of the Fifteen Sounds
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The Mystery Boys and the Inca Gold
Powell, Van
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The Ghost of Mystery Airport
Powell, Van