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Simillar with The Airmail Mystery

Spy SmasherSpy Smasher
Jungle QueenJungle Queen
The Great Alaskan MysteryThe Great Alaskan Mystery
The Secret KingdomThe Secret Kingdom
The Green HornetThe Green Hornet
Bruce GentryBruce Gentry
The Black CoinThe Black Coin
The Wolf DogThe Wolf Dog
Hands UpHands Up
Beatrice FairfaxBeatrice Fairfax
Who Will Marry Mary?Who Will Marry Mary?
The Beloved AdventurerThe Beloved Adventurer
The Fates and Flora FourflushThe Fates and Flora Fourflush
The Hidden HandThe Hidden Hand
The Tiger's TrailThe Tiger's Trail
The Secret of the SubmarineThe Secret of the Submarine
The King of the KongoThe King of the Kongo
Jungle MenaceJungle Menace
Congo BillCongo Bill
The Iron ClawThe Iron Claw