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Chronology: 1950-1959
1950
The Bobbsey Twins (The Bobbsey Twins 1: revised edition)
The Bobbsey Twins in Rainbow Valley (The Bobbsey Twins 43)
The Bobbsey Twins in the Country (The Bobbsey Twins 2: revised edition)
The Secret of the Wooden Lady (Nancy Drew Mystery Stories 27)
The Secret of the Lost Tunnel (The Hardy Boys Mystery Stories 29)
1951
The Bobbsey Twins’ Own Little Railroad (The Bobbsey Twins 44)
The Clue of the Black Keys (Nancy Drew Mystery Stories 28)
The Wailing Siren Mystery (The Hardy Boys Mystery Stories 30)
1952
The Bobbsey Twins at Whitesail Harbor (The Bobbsey Twins 45)
The Clue in the Ivy (The Dana Girls Mystery Stories 14)
The Mystery at the Ski Jump (Nancy Drew Mystery Stories 29)
The Secret of Wildcat Swamp (The Hardy Boys Mystery Stories 31)
1953
The Bobbsey Twins and the Horseshoe Riddle (The Bobbsey Twins 46)
The Bobbsey Twins at Big Bear Pond (The Bobbsey Twins 47)
The Clue of the Velvet Mask (Nancy Drew Mystery Stories 30)
The Crisscross Shadow (The Hardy Boys Mystery Stories 32)
The Ringmaster’s Secret (Nancy Drew Mystery Stories 31)
The Secret in the Jade Ring (The Dana Girls Mystery Stories 15)
The Yellow Feather Mystery (The Hardy Boys Mystery Stories 33)
1954
The Bobbsey Twins on a Bicycle Trip (The Bobbsey Twins 48)
The Hooded Hawk Mystery (The Hardy Boys Mystery Stories 34)
The Mystery at the Crossroads (The Dana Girls Mystery Stories 16)
The Scarlet Slipper Mystery (Nancy Drew Mystery Stories 32)
Tom Swift and His Atomic Earth Blaster (The New Tom Swift Jr. Adventures 5)
Tom Swift and His Flying Lab (The New Tom Swift Jr. Adventures 1)
Tom Swift and His Giant Robot (The New Tom Swift Jr. Adventures 4)
Tom Swift and His Jetmarine (The New Tom Swift Jr. Adventures 2)
Tom Swift and His Rocket Ship (The New Tom Swift Jr. Adventures 3)
1955
The Bobbsey Twins Camping Out (The Bobbsey Twins 16: revised edition)
The Bobbsey Twins on a Houseboat (The Bobbsey Twins 6: revised edition)
The Clue in the Embers (The Hardy Boys Mystery Stories 35)
The Ghost in the Gallery (The Dana Girls Mystery Stories 17)
Tom Swift and His Outpost in Space (The New Tom Swift Jr. Adventures 6)
The Witch Tree Symbol (Nancy Drew Mystery Stories 33)
1956
The Bobbsey Twins’ Own Little Ferryboat (The Bobbsey Twins 49)
The Clue of the Black Flower (The Dana Girls Mystery Stories 18)
The Hidden Window Mystery (Nancy Drew Mystery Stories 34)
The Secret of Pirates’ Hill (The Hardy Boys Mystery Stories 36)
Tom Swift and His Diving Seacopter (The New Tom Swift Jr. Adventures 7)
Tom Swift in the Caves of Nuclear Fire (The New Tom Swift Jr. Adventures 8]
Tom Swift on the Phantom Satellite (The New Tom Swift Jr. Adventures 9)
1957
The Ghost at Skeleton Rock (The Hardy Boys Mystery Stories 37)
The Haunted Showboat (Nancy Drew Mystery Stories 35)
Tom Swift and His Ultrasonic Cycloplane (The New Tom Swift Jr. Adventures 10)
The Winking Ruby Mystery (The Dana Girls Mystery Stories 19)
1958
The Bobbsey Twins at Pilgrim Rock (The Bobbsey Twins 50)
The Bobbsey Twins’ Forest Adventure (The Bobbsey Twins 51)
The Secret of the Swiss Chalet (The Dana Girls Mystery Stories 20)
Tom Swift and His Deep-Sea Hydrodome (The New Tom Swift Jr. Adventures 11)
Tom Swift and His Space Solartron (The New Tom Swift Jr. Adventures 13)
Tom Swift in the Race to the Moon (The New Tom Swift Jr. Adventures 12)
1959
The Bobbsey Twins at London Tower (The Bobbsey Twins 52)
The Bobbsey Twins on Blueberry Island (The Bobbsey Twins 10: revised edition)
The Hardy Boys’ Detective Handbook
The Haunted Lagoon (The Dana Girls Mystery Stories 21)
The Hidden Staircase (Nancy Drew Mystery Stories 2: revised edition)
The House on the Cliff (The Hardy Boys Mystery Stories 2: revised edition)
The Mystery at Devil’s Paw (The Hardy Boys Mystery Stories 38)
The Secret of the Golden Pavilion (Nancy Drew Mystery Stories 36)
The Secret of the Old Clock (Nancy Drew Mystery Stories 1: revised edition)
Tom Swift and His Electronic Retroscope (The New Tom Swift Jr. Adventures 14)
The Tower Treasure (The Hardy Boys Mystery Stories 1: revised edition)