001-The Tower Treasure
Franklin W. Dixon
Hardy Boys Mystery Series (1)
002-The House On The Cliff
Hardy Boys Mystery Series (2)
003-The Secret Of The Old Mill
Hardy Boys Mystery Series (3)
004-The Missing Chums
Hardy Boys Mystery Series (4)
005-Hunting For Hidden Gold
Hardy Boys Mystery Series (5)
006-The Shore Road Mystery
Hardy Boys Mystery Series (6)
007-The Secret Of The Caves
Hardy Boys Mystery Series (7)
008-The Mystery Of Cabin Island
Hardy Boys Mystery Series (8)
009-The Great Airport Mystery
Hardy Boys Mystery Series (9)
010-What Happend At Midnight
Hardy Boys Mystery Series (10)
011-While The Clock Ticked
Hardy Boys Mystery Series (11)
012-Footprints Under The Window
Hardy Boys Mystery Series (12)
013-The Mark On The Door
Hardy Boys Mystery Series (13)
014-A Stormy Night
Hardy Boys Mystery Series (14)
015-The Sinister Signpost
Hardy Boys Mystery Series (15)
016-A Figure In Hiding
Hardy Boys Mystery Series (16)
017-The Secret Warning
Hardy Boys Mystery Series (17)
018-The Twisted Claw
Hardy Boys Mystery Series (18)
019-The Disappearing Floor
Hardy Boys Mystery Series (19)
020-The Mystery Of The Flying Express
Hardy Boys Mystery Series (20)
031-The Secret Of Wildcat Swamp
Hardy Boys Mystery Series (31)
032-The Crisscross Shadow
Hardy Boys Mystery Series (32)
033-The Yellow Feather Mystery
Hardy Boys Mystery Series (33)
035-The Clue In The Embers
Hardy Boys Mystery Series (35)
034-The Hooded Hawk Mystery
Hardy Boys Mystery Series (34)
036-The Secret Of Pirates Hill
Hardy Boys Mystery Series (36)
038-The Mystery Of The Devils Paw
Hardy Boys Mystery Series (38)
037-The Ghost At Skeleton Rock
Hardy Boys Mystery Series (37)
039-The Mystery Of The Chinese Junk
Hardy Boys Mystery Series (39)
040-Mystery Of The Desert Giant
Hardy Boys Mystery Series (40)
041-The Clue Of The Screeching Owl
Hardy Boys Mystery Series (41)
042-The Viking Symbol Mystery
Hardy Boys Mystery Series (42)
043-The Mystery Of The Aztec Warrior
Hardy Boys Mystery Series (43)
044-The Haunted Fort
Hardy Boys Mystery Series (44)
045-The Mystery Of The Spiral Bridge
Hardy Boys Mystery Series (45)
046-The Secret Agent Of Flight 101
Hardy Boys Mystery Series (46)
047-Mystery Of The Whale Tattoo
Hardy Boys Mystery Series (47)
048-The Arctic Patrol Mystery
Hardy Boys Mystery Series (48)
049 The Bombay Boomerang
The Hardy Boys Mystery Stories (49)
050 Danger on Vampire Trail
The Hardy Boys Mystery Stories (50)