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Simillar with The Airmail Mystery

Mysterious Doctor SatanMysterious Doctor Satan
The Lost SpecialThe Lost Special
The Black SecretThe Black Secret
The Lightning RaiderThe Lightning Raider
Pearl of the ArmyPearl of the Army
The Million Dollar MysteryThe Million Dollar Mystery
The Adventures of Smilin' JackThe Adventures of Smilin' Jack
Flash GordonFlash Gordon
The Adventure of the Torture CageThe Adventure of the Torture Cage
The Adventures of KathlynThe Adventures of Kathlyn
The Brass BulletThe Brass Bullet
The Ventures of MargueriteThe Ventures of Marguerite
Mysterious IslandMysterious Island
The Timber QueenThe Timber Queen
King of the WildKing of the Wild
The New Adventures of TarzanThe New Adventures of Tarzan
BelphégorBelphégor
The Broken CoinThe Broken Coin
Daughter of Don QDaughter of Don Q
Trader Tom of the China SeasTrader Tom of the China Seas