Roy Rockwood

Roy Rockwood is a Stratemeyer Syndicate house name that appeared on many series books, but the two most famous were Bomba the Jungle Boy and the Great Marvel Series. The lion's share of the latter were actually written by Howard Garis. Though Garis is commonly assumed to have written the Bomba books as well, the actual author was John Duffield. 
Dave Fearless
   1. Rival Ocean Divers (1905)
     aka The Search for a Sunken Treasure
   2. The Cruise of the Treasure Ship (1905)
     aka The Castaways of Floating Island
   3. Dave Fearless and the Cave of Mystery (1908)
     aka Adrift on the Pacific
   5. Dave Fearless Wrecked Among Savages (1926)
     aka The Captives of the Head Hunters
   8. Captured By Apes (1926)
     aka Lost in Gorilla Land
   9. Dave Fearless and the Mutineers (1926)
     aka Prisoners On the Ship of Death
   15. Dave Fearless On the Lost Brig (1927)
     aka Abandoned in the Big Hurricane
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Dave Dashaway
   2. Dave Dashaway and his Hydroplane (1913)
   Dave Dashaway and His Giant Airship (1913)
     aka A Marvellous Trip Across the Atlantic
   Dave Dashaway Around the World (1913)
     aka A Young Yankee Aviator Among Many Nations
   Dave Dashaway the Young Aviator (1913)
     aka In the Clouds for Fame and Fortune
   Dave Dashaway Air Champion (1915)
     aka Wizard Work in the Clouds
Speedwell Boys
   1. The Speedwell Boys On Motorcycles (1913)
     aka The Mystery of a Great Conflagration
   2. The Speedwell Boys and Their Racing Auto (1913)
     aka Run for the Golden Cup
   5. The Speedwell Boys and Their Ice Racer (1915)
     aka Lost in the Great Blizzard
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Bomba, the Jungle Boy
   The Giant Cataract (1926)
     aka Chief Nascanora And His Captives
   The Moving Mountain (1926)
     aka The Mystery of the Caves of Fire
   The Abandoned City (1927)
     aka A Treasure Ten Thousand Years Old
   Jaguar Island (1927)
   Terror Trail (1928)
     aka The Mysterious Men from the Sky
   Among the Slaves (1929)
     aka Daring Adventures in the Valley of Skulls
   Bomba the Jungle Boy (1929)
   The Swamp of Death (1929)
     aka The Sacred Alligators of Abarago
   The Lost Explorers (1930)
     aka A Wonderful Revelation
   The Underground River (1930)
     aka The Cave of Bottomless Pits
   Among The Pygmies (1931)
     aka Battling with Stealthy Foes
   The Cannibals (1932)
     aka Winning Against Native Dangers
   The Painted Hunters (1932)
   The River Demons (1933)
     aka Outwitting the Savage Medicine Man
   The Hostile Chieftain (1934)
     aka A Hazardous Trek to the Sea
   Trapped By the Cyclone (1935)
     aka Shipwrecked On the Swirling Seas
   The Land of Burning Lava (1936)
     aka Outwitting Superstitious Natives
   The Perilous Kingdom (1937)
     aka Braving Strange Hazards
   The Steaming Grotto (1938)
     aka Victorious Through Flame And Fury
   A Schoolboy's Pluck (1900)
     aka The Career of a Nobody
   The Wizard of the Sea (1900)
     aka ATrip Under the Ocean
   Through the Air to the North Pole (1906)
     aka The Wonderful Cruise of the Electric Monarch
   Five Thousand Miles Underground (1907)
     aka The Mystery Of The Centre of The Earth
   Jack North's Treasure Hunt (1907)
     aka Daring Adventures in South America
   Under the Ocean to the South Pole (1907)
     aka The Strange Cruise of the Submarine Wonder
   Through Space to Mars (1910)
     aka The Longest Journey On Record
   Lost On The Moon (1911)
     aka In Quest Of The Field Of Diamonds
   On a Torn-Away World (1913)
     aka The Captives of the Great Earthquake
   The City Beyond the Clouds (1925)
     aka Captured By the Red Dwarfs
   By Air Express to Venus (1929)
     aka Captives of a Strange People
   By Space Ship to Saturn (1935)
     aka Exploring the Ringed Planet
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