#1-38
#1, 1950  Norwegian Title: Hardyguttene og skatten i tårnet. Translated Title: Original Title: The Tower Treasure.
#2, 1950  Norwegian Title: Hardyguttene på nye eventyr. Translated Title: The Hardy Boys on new adventures. Original Title: The House on the Cliff.
#3, 1951  Norwegian Title: Hardyguttene på falskmyntnerjakt. Translated Title: The Hardy Boys hunting for Counterfeiters. Original Title: The Secret of the old Mill
#4, 1951  Norwegian Title: Hardyguttene på gangsterjakt. Translated Title: The Hardy Boys hunting for Gangsters. Original Title: Missing Chums (Revised as # 63).
#5, 1951  Norwegian Title: Rødt lys for Hardyguttene. Translated Title: Red Light for the Hardy Boys. Original Title: Hunting for Hidden Gold.
#6, 1951  Norwegian Title: Hardyguttene jager biltyvene. Translated Title: The Hardy Boys chasing the carthieves. Original Title: The Shore Road Mystery.
#7, 1952  Norwegian Title: Hardyguttene avslører huleboeren. Translated Title: The Hardy Boys reveal the Caveman. Original Title: The Secret of the Caves.
#8, 1952  Norwegian Title: Hardyguttene og den stjålne frimerkesamlingen. Translated Title: The Hardy Boys and the stolen Stamp Collection. Original Title: The Mystery of Cabin Island.
#9, 1952  Norwegian Title: Hardyguttene og mysteriet på flyplassen. Translated Title: Original Title: The Great Airport Mystery (Revised as # 49).
#10, 1952  Norwegian Title: Klokken slår tolv for Hardyguttene. Translated Title: The Clock strikes twelve for the Hardy Boys. Original Title: What happened at Midnight.
#11, 1952  Norwegian Title: Hardyguttene og den mystiske klokke. Translated Title: The Hardy Boys and the mysterious Clock. Original Title: While the Clock ticked.
#12, 1953  Norwegian Title: Hardyguttene på sporet. Translated Title: The Hardy Boys on the Track. Original Title: Footprints under the Window (Revised as # 47).
#13, 1953  Norwegian Title: Hardyguttene i Mexico. Translated Title: The Hardy Boys in Mexico. Original Title: Mark on the Door.
#14, 1953  Norwegian Title: Siste stikk til Hardyguttene. Translated Title: Last trick to the Hardy Boys . Original Title: The Hidden Harbor Mystery (Revised as # 51).
#15, 1953  Norwegian Title: Hardyguttene går i dekning. Translated Title: The Hardy Boys goes under cover. Original Title: The Sinister Sign Post (Revised as # 69).
#16, 1953  Norwegian Title: Hardyguttene og den falske legen. Translated Title: The Hardy Boys and the fake doctor. Original Title: A Figure in Hiding (Revised as # 53).
#17, 1954  Norwegian Title: Hardyguttene og dykkermysteriet. Translated Title: The Hardy Boys and the Diving Mystery. Original Title: The Secret Warning (Revised as # 67).
#18, 1954  Norwegian Title: Hardyguttene blant pirater. Translated Title: The Hardy Boys among Pirats. Original Title: The Twisted Claw.
#19, 1954  Norwegian Title: Hardyguttene og bankrøverne. Translated Title: The Hardy Boys and the Bank Robbers. Original Title: The Disappearing Floor (Revised as # 65).
#20, 1954  Norwegian Title: Hardyguttene knuser spionringen. Translated Title: The Hardy Boys trash the Ring of Spies. Original Title: The Flying Express (Revised as # 59).
#21, 1954  Norwegian Title: Hardyguttene og den forsvunne arvingen. Translated Title: The Hardy Boys and the Lost Heir. Original Title: The Clue of the Broken Blade (Revised as # 61).
#22, 1955  Norwegian Title: Hardyguttene og fakkelmysteriet. Translated Title: The Hardy Boys and the Torch Mystery. Original Title: The Flickering Torch (Revised as # 57).
#23, 1955  Norwegian Title: Hardyguttene og den mystiske tatovering. Translated Title: The Hardy Boys and the Mysterious Tattoo. Original Title: The Melted Coins (Revised as # 55).
#24, 1955  Norwegian Title: Hardyguttene og radiomysteriet. Translated Title: The Hardy Boys and the Radio Mystery. Original Title: The Shortwave Mystery.
#25, 1955  Norwegian Title: Hardyguttene i død manns hus. Translated Title: The Hardy Boys in a Dead Man's House. Original Title: The Secret Panel.
#26, 1955  Norwegian Title: Hardyguttene og spøkeleseskipet. Translated Title: Original Title: The Phantom Freighter.
#27, 1956  Norwegian Title: Hardyguttene og den mystiske skalle. Translated Title: The Hardy Boys and the Mysterious Skull. Original Title: The Secret of Skull Mountain.
#28, 1956  Norwegian Title: Hardyguttene og den forgiftede pil. Translated Title: The Hardy Boys and the Poisonous Arrow. Original Title: The Sign of the Crooked Arrow.
#29, 1956  Norwegian Title: Hardyguttene løser kodemysteriet. Translated Title: The Hardy Boys solve the Code Mystery. Original Title: The Secret of the Lost Tunnel.
#30, 1956  Norwegian Title: Hardyguttene og den hylende sirene. Translated Title: Original Title: The Wailing Sirene Mystery.
#31, 1957  Norwegian Title: Hardyguttene i Daudmannsmyra. Translated Title: The Hardy Boys at Dead Man's Swamp. Original Title: The Secret of Wildcat Swamp.
#32, 1957  Norwegian Title: Hardyguttene og den hemmelige skrift. Translated Title: The Hardy Boys and the Secret Writing. Original Title: The Crisscross Shadow.
#33, 1957  Norwegian Title: Hardyguttene og operasjon den gule fjær. Translated Title: The Hardy Boys and the Yellow Feather Operation. Original Title: The Yellow Feather Mystery.
#34, 1958  Norwegian Title: Hardyguttene og rubinmysteriet. Translated Title: The Hardy Boys and the Ruby Mystery. Original Title: The Hooded Hawk Mystery.
#35, 1958  Norwegian Title: Hardyguttene og vrakets hemmelighet. Translated Title: The Hardy Boys and the Secret of the Wreck. Original Title: The Secret of Pirat's Hill.
#36, 1958  Norwegian Title: Hardyguttene og indianerskatten. Translated Title: The Hardy Boys and the Indian Treasure. Original Title: The Clue in the Embers.
#37, 1959  Norwegian Title: Hardyguttene og skjelettgåten. Translated Title: The Hardy Boys and the Skeleton Riddle. Original Title: The Ghost at Skeleton Rock.
#38, 1960  Norwegian Title: Hardyguttene og måneraketten. Translated Title: The Hardy Boys and the Moon Rocket. Original Title: The Mystery at Devil's Paw.
Hardyguttenes Detektivhåndbok, 1959. 
Original Title: The Hardy Boys Detective Handbook.
These titles are all included in my Cover Art Gallery.
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