The missing chums - Franklin W. Dixon

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Oliver Bright's Search; or, The Mystery of a Mine - Edward Stratemeyer

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Dave Porter on Cave Island; Or, A Schoolboy's Mysterious Mission - Edward Stratemeyer

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The Daughter of Anderson Crow - George Barr McCutcheon

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The Mystery at Putnam Hall: The School Chums' Strange Discovery - Edward Stratemeyer

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The Last Retreat: A Wellness Retreat Murder Mystery - Carter Bryson

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