The Secret Four

Lucille Love, Girl of Mystery • The Master Key • The Trey o' Hearts • The Black Box • The Broken Coin • Graft • Under the Crescent • The Adventures of Peg o' the Ring • Liberty • The Mystery Ship • The Red Ace • The Gray Ghost • The Voice on the Wire • The Brass Bullet • Bull's Eye • The Lion's Claws • Lure of the Circus • The Red Glove • The Great Radium Mystery • The Lion Man • The Midnight Man • The Flaming Disc • The Moon Riders • King of the Circus • The Vanishing Dagger • The Dragon's Net • The Diamond Queen • Do or Die • The Secret Four • Terror Trail • The White Horseman • Winners of the West • The Adventures of Robinson Crusoe • In the Days of Buffalo Bill • Perils of the Yukon • The Radio King • With Stanley in Africa • Around the World in Eighteen Days • Beasts of Paradise • The Eagle's Talons • The Ghost City • In the Days of Daniel Boone • The Oregon Trail • The Phantom Fortune • The Social Buccaneer • The Steel Trail • The Fast Express • The Fighting Ranger • The Iron Man • The Riddle Rider • Wolves of the North • Ace of Spades • The Great Circus Mystery • The Scarlet Streak • Fighting with Buffalo Bill • Strings of Steel • The Winking Idol • Blake of Scotland Yard • The Fire Fighters • The Return of the Riddle Rider • The Trail of the Tiger • Whispering Smith Rides • Haunted Island • Tarzan the Mighty • The Vanishing Rider • The Diamond Master • A Final Reckoning • The Pirate of Panama

Finger Prints • Heroes of the Flames • Danger Island • Battling with Buffalo Bill • The Spell of the Circus • Detective Lloyd • The Airmail Mystery • Heroes of the West • The Jungle Mystery • The Lost Special • Clancy of the Mounted • The Phantom of the Air • Gordon of Ghost City • The Perils of Pauline • Pirate Treasure • The Vanishing Shadow • The Red Rider • Tailspin Tommy • Rustlers of Red Dog • The Call of the Savage • The Roaring West • Tailspin Tommy in the Great Air Mystery • The Adventures of Frank Merriwell • Flash Gordon • The Phantom Rider • Ace Drummond • Jungle Jim • Secret Agent X-9 • Wild West Days • Radio Patrol • Tim Tyler's Luck • Flash Gordon's Trip to Mars • Flaming Frontiers • Red Barry • Scouts to the Rescue • Buck Rogers • The Oregon Trail • The Phantom Creeps • The Green Hornet • Flash Gordon Conquers the Universe • Winners of the West • Junior G-Men • The Green Hornet Strikes Again • Sky Raiders • Riders of Death Valley • Sea Raiders

The Royal Mounted Rides Again • The Scarlet Horseman • Lost City of the Jungle • The Mysterious Mr. M

Ford Beebe • Lewis D. Collins • Robert F. Hill • Lew Landers • Henry MacRae • J. P. McGowan • George H. Plympton • Clifford Smith • Ray Taylor