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Simillar with The Fortieth Door

Don Winslow of the NavyDon Winslow of the Navy
The Amazing Exploits of the Clutching HandThe Amazing Exploits of the Clutching Hand
The Diamond from the SkyThe Diamond from the Sky
The Great Radium MysteryThe Great Radium Mystery
Flash GordonFlash Gordon
Lost City of the JungleLost City of the Jungle
Pirate TreasurePirate Treasure
The Secret CodeThe Secret Code
Trader Tom of the China SeasTrader Tom of the China Seas
King of the CongoKing of the Congo
Hurricane HutchHurricane Hutch
King of the WildKing of the Wild
Junior G-Men of the AirJunior G-Men of the Air
Jungle GirlJungle Girl
Mysterious Doctor SatanMysterious Doctor Satan
Son of the GuardsmanSon of the Guardsman
The Adventures of Frank MerriwellThe Adventures of Frank Merriwell
The Sea HoundThe Sea Hound
Darkest AfricaDarkest Africa
Jungle Drums of AfricaJungle Drums of Africa