651 books • 49 series
The Missing Chums: the Hardy Boys Book 4 (Dover Books on Literature & Drama)
The Hardy Boys Super Pack
Splash Pad Sabotage (Hardy Boys Clue Book, #17)
The Hardy Boys Collection #2
Hunting for Hidden Gold (Hardy Boys, #5)
Adventures, #8
Undercover Bookworms (Hardy Boys Clue Book, #16)
The Smuggler's Legacy (Hardy Boys Adventures, #25)
The Hardy Boys Collection
The Garden Plot (Hardy Boys Clue Book, #15)
The Garden Plot (Hardy Boys Clue Book)
As the Falcon Flies (Hardy Boys Adventures, #24)
As the Falcon Flies (Hardy Boys Adventures)
The Bad Luck Skate (Hardy Boys Clue Book, #14)
The Bad Luck Skate (Hardy Boys Clue Book)
The Battle of Bayport: #6 (Hardy Boys Adventures)
Into Thin Air: #4 (Hardy Boys Adventures)
Peril at Granite Peak: #5 (Hardy Boys Adventures)
The Vanishing Game: #3 (Hardy Boys Adventures)
Hardy Boys Adventures (Set) (Hardy Boys Adventures)
Mystery of the Phantom Heist: #2 (Hardy Boys Adventures)
Secret of the Red Arrow: #1 (Hardy Boys Adventures)
Mystery on the Mayhem Express (Hardy Boys Adventures, #23)
Mystery on the Mayhem Express (Hardy Boys Adventures)