#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.