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THE OUTBOARD BOYS AT MYSTERY ISLAND; or, Solving the Secret of
Hidden Cove -- 1933. A.L. Burt.
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THE OUTBOARD BOYS AT SHADOW LAKE; or, Solving the Secret of the
Strange Monster -- 1933. A.L. Burt.
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THE OUTBOARD BOYS AT PIRATE BEACH; or, Solving the Secret of the
Houseboat -- 1933. A.L. Burt.
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THE OUTBOARD BOYS AT SHARK RIVER; or, Solving the Secret of
Mystery Tower -- 1934. A.L. Burt.
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