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Chronology: 1960-1969
1960
The Bobbsey Twins and the County Fair Mystery (The Bobbsey Twins 15: revised edition)
The Bobbsey Twins and the Mystery at Snow Lodge (The Bobbsey Twins 5: revised edition)
The Bobbsey Twins at the Circus Surprise (The Bobbsey Twins 25: revised edition)
The Bobbsey Twins’ Big Adventure at Home (The Bobbsey Twins 8: revised edition)
The Bobbsey Twins in the Mystery Cave (The Bobbsey Twins 53)
The Bobbsey Twins’ Search in the Great City (The Bobbsey Twins 9: revised edition)
The Bungalow Mystery (Nancy Drew Mystery Stories 3: revised edition)
The Clue in the Old Stagecoach (Nancy Drew Mystery Stories 37)
Mystery of the Bamboo Bird (The Dana Girls Mystery Stories 22)
The Mystery of the Chinese Junk (The Hardy Boys Mystery Stories 39)
Tom Swift and His Spectromarine Selector (The New Tom Swift Jr. Adventures 15)
Tom Swift and the Cosmic Astronauts (The New Tom Swift Jr. Adventures 16)
1961
The Bobbsey Twins’ Adventure in the Country (The Bobbsey Twins 2: revised edition)
The Bobbsey Twins in Volcano Land (The Bobbsey Twins 54)
The Bobbsey Twins of Lakeport (The Bobbsey Twins 1: revised edition)
The Hidden Harbor Mystery (The Hardy Boys Mystery Stories 14: revised edition)
Mystery of the Desert Giant (The Hardy Boys Mystery Stories 40)
The Mystery of the Fire Dragon (Nancy Drew Mystery Stories 38)
The Secret of Red Gate Farm (Nancy Drew Mystery Stories 6: revised edition)
The Sierra Gold Mystery (The Dana Girls Mystery Stories 23)
Tom Swift and the Electronic Hydrolung (The New Tom Swift Jr. Adventures 18)
Tom Swift and the Visitor from Planet X (The New Tom Swift Jr. Adventures 17)
1962
The Bobbsey Twins and the Goldfish Mystery (The Bobbsey Twins 55)
The Bobbsey Twins and the Mystery at School (The Bobbsey Twins 4: revised edition)
The Bobbsey Twins’ Secret at the Seashore (The Bobbsey Twins 3: revised edition)
The Bobbsey Twins’ Wonderful Winter Secret (The Bobbsey Twins 24: revised edition)
The Clue in the Diary (Nancy Drew Mystery Stories 7: revised edition)
The Clue of the Dancing Puppet (Nancy Drew Mystery Stories 39)
The Clue of the Screeching Owl (The Hardy Boys Mystery Stories 41)
Footprints Under the Window (The Hardy Boys Mystery Stories 12: revised edition)
The Missing Chums (The Hardy Boys Mystery Stories 4: revised edition)
The Secret of the Old Mill (The Hardy Boys Mystery Stories 3: revised edition)
Tom Swift and His Megascope Space Prober (The New Tom Swift Jr. Adventures 20)
Tom Swift and His Triphibian Atomicar (The New Tom Swift Jr. Adventures 19)
While the Clock Ticked (The Hardy Boys Mystery Stories 11: revised edition)
1963
The Bobbsey Twins’ Adventure in Washington (The Bobbsey Twins 12: revised edition)
The Bobbsey Twins and the Big River Mystery (The Bobbsey Twins 56)
The Bobbsey Twins’ Mystery at Meadowbrook] (The Bobbsey Twins 7; 1963, reissued 2004; revised edition 1990)
Hunting for Hidden Gold (The Hardy Boys Mystery Stories 5: revised edition)
The Moonstone Castle Mystery (Nancy Drew Mystery Stories 40)
Mystery of the Stone Tiger (The Dana Girls Mystery Stories 25)
The Secret of Lost Lake (The Dana Girls Mystery Stories 24)
Tom Swift and the Asteroid Pirates (The New Tom Swift Jr. Adventures 21)
Tom Swift and His Repelatron Skyway (The New Tom Swift Jr. Adventures 22)
The Viking Symbol Mystery (The Hardy Boys Mystery Stories 42)
1964
The Bobbsey Twins and the Greek Hat Mystery (The Bobbsey Twins 57)
The Clue of the Whistling Bagpipes (Nancy Drew Mystery Stories 41)
The Disappearing Floor (The Hardy Boys Mystery Stories 19: revised edition)
The Mystery of the Aztec Warrior (The Hardy Boys Mystery Stories 43)
The Riddle of the Frozen Fountain (The Dana Girls Mystery Stories 26)
The Shore Road Mystery (The Hardy Boys Mystery Stories 6: revised edition)
Tom Swift and His Aquatomic Tracker (The New Tom Swift Jr. Adventures 23)
Tom Swift and His 3-D Telejector (The New Tom Swift Jr. Adventures 24)
1965
The Bobbsey Twins’ Mystery on the Deep Blue Sea (The Bobbsey Twins 11: revised edition)
The Bobbsey Twins’ Search for the Green Rooster (The Bobbsey Twins 58)
The Clue of the Broken Locket (Nancy Drew Mystery Stories 11: revised edition)
A Figure in Hiding (The Hardy Boys Mystery Stories 16: revised edition)
The Great Airport Mystery (The Hardy Boys Mystery Stories 9: revised edition)
The Haunted Fort (The Hardy Boys Mystery Stories 44)
The Phantom of Pine Hill (Nancy Drew Mystery Stories 42)
The Secret of Shadow Ranch (Nancy Drew Mystery Stories 5: revised edition)
The Secret of the Caves (The Hardy Boys Mystery Stories 7: revised edition)
The Secret of the Silver Dolphin (The Dana Girls Mystery Stories 27)
Tom Swift and His Polar-Ray Dynasphere (The New Tom Swift Jr. Adventures 25)
Tom Swift and His Sonic Boom Trap (The New Tom Swift Jr. Adventures 26)
1966
The Bobbsey Twins and Their Camel Adventure (The Bobbsey Twins 59)
The Bobbsey Twins’ Visit to the Great West (The Bobbsey Twins 13: revised edition)
The Ghost at Skeleton Rock (The Hardy Boys Mystery Stories 37: revised edition)
The Mystery of Cabin Island (The Hardy Boys Mystery Stories 8: revised edition)
The Mystery of the 99 Steps (Nancy Drew Mystery Stories 43)
The Mystery of the Spiral Bridge (The Hardy Boys Mystery Stories 45)
Mystery of the Wax Queen (The Dana Girls Mystery Stories 28)
Password to Larkspur Lane (Nancy Drew Mystery Stories 10: revised edition)
The Secret of Skull Mountain (The Hardy Boys Mystery Stories 27: revised edition)
The Secret Warning (The Hardy Boys Mystery Stories 17: revised edition)
The Short-Wave Mystery (The Hardy Boys Mystery Stories 24: revised edition)
Tom Swift and His Subocean Geotron (The New Tom Swift Jr. Adventures 27)
Tom Swift and the Mystery Comet (The New Tom Swift Jr. Adventures 28)
1967
The Bobbsey Twins and the Cedar Camp Mystery (The Bobbsey Twins 14: revised edition)
The Bobbsey Twins’ Mystery of the King’s Puppet (The Bobbsey Twins 60)
The Clue in the Crossword Cipher (Nancy Drew Mystery Stories 44)
The Clue of the Leaning Chimney (Nancy Drew Mystery Stories 26: revised edition)
The Ghost of Blackwood Hall (Nancy Drew Mystery Stories 25: revised edition)
The Mark on the Door (The Hardy Boys Mystery Stories 13: revised edition)
The Mystery at Lilac Inn (Nancy Drew Mystery Stories 4: revised edition)
The Secret Agent on Flight 101 (The Hardy Boys Mystery Stories 46)
The Secret of the Minstrel’s Guitar (The Dana Girls Mystery Stories 29)
The Secret of the Wooden Lady (Nancy Drew Mystery Stories 27: revised edition)
Tom Swift and the Captive Planetoid (The New Tom Swift Jr. Adventures 29)
What Happened at Midnight (The Hardy Boys Mystery Stories 10: revised edition)
1968
The Bobbsey Twins’ Adventures with Baby May (The Bobbsey Twins 17: revised edition)
The Bobbsey Twins and the Four-Leaf Clover Mystery (The Bobbsey Twins 19: revised edition)
The Bobbsey Twins and the Play House Secret (The Bobbsey Twins 18: revised edition)
The Bobbsey Twins and the Secret of Candy Castle (The Bobbsey Twins 61)
The Mystery of the Flying Express (The Hardy Boys Mystery Stories 20: revised edition)
Mystery of the Whale Tattoo (The Hardy Boys Mystery Stories 47)
Nancy’s Mysterious Letter (Nancy Drew Mystery Stories 8: revised edition)
The Phantom Surfer (The Dana Girls Mystery Stories 30)
The Secret of the Lost Tunnel (The Hardy Boys Mystery Stories 29: revised edition)
The Sign of the Twisted Candles (Nancy Drew Mystery Stories 9: revised edition)
The Sinister Signpost (The Hardy Boys Mystery Stories 15: revised edition)
The Spider Sapphire Mystery (Nancy Drew Mystery Stories 45)
Tom Swift and His G-Force Inverter (The New Tom Swift Jr. Adventures 30)
The Wailing Siren Mystery (The Hardy Boys Mystery Stories 30: revised edition)
1969
The Arctic Patrol Mystery (The Hardy Boys Mystery Stories 48)
The Bobbsey Twins and the Doodlebug Mystery (The Bobbsey Twins 62)
The Clue of the Broken Blade (The Hardy Boys Mystery Stories 21: revised edition)
The Clue of the Tapping Heels (Nancy Drew Mystery Stories 16: revised edition)
The Clue of the Velvet Mask (Nancy Drew Mystery Stories 30: revised edition)
The Crisscross Shadow (The Hardy Boys Mystery Stories 32: revised edition)
The Invisible Intruder (Nancy Drew Mystery Stories 46)
The Quest of the Missing Map (Nancy Drew Mystery Stories 19: revised edition)
The Secret of Wildcat Swamp (The Hardy Boys Mystery Stories 31: revised edition)
The Secret Panel (The Hardy Boys Mystery Stories 25: revised edition)
Tom Swift and His Dyna-4 Capsule (The New Tom Swift Jr. Adventures 31)
The Twisted Claw (The Hardy Boys Mystery Stories 18: revised edition)