16 A Figure in Hiding (1965):🕵🏻Vintage Hardy Boys Book Blue-Back
29 Secret of the Lost Tunnel (1950/1968 RN):🕵🏻Hardy Boys Book Blue-Back
31 Secret of Wildcat Swamp (1952/1969-YN):🕵🏻Vintage Hardy Boys Book Blue-Back
52 The Shattered Helmet (1973 Yellow Number):🕵🏻Hardy Boys Book Blue-Back
40 The Mystery of the Desert Giant (1961 Brown):🕵🏻Hardy Boys Book Blue-Back
12 Footprints Under the Window (1965):🕵🏻Vintage Hardy Boys Book Blue-B
17 The Secret Warning (1966-YN Cameo):🕵🏻Hardy Boys Book Blue-Back
10 What Happened at Midnight (1967 Yellow Number):🕵🏻Hardy Boys Book Blue-Bac
34 The Hooded Hawk Mystery (1954/1971-YN):🕵🏻Vintage Hardy Boys Book Blue-Back
27 The Secret of Skull Mountain (1966-YN-Cameo):🕵🏻Hardy Boys Book Bl
02 The House on the Cliff (1959-Brown End Page):🕵🏻Hardy Boys Book Blue-Back
28 The Sign of the Crooked Arrow (1970 Red Number):🕵🏻Hardy Boys Book Blue
21 The Clue of the Broken Blade (1970-Yellow Number ):🕵🏻Hardy Boys Book Blue-
01 The Tower Treasure (Blue Bar/Cameo):🕵🏻Hardy Boys Book Blue-Back
The Hardy Boys Detective Handbook🕵🏻Vintage Hardy Boys Book
09 The Great Airport Mystery (1965-BE):🕵🏻Vintage Hardy Boys Book Blue-Bac
08 The Mystery of Cabin Island (1966-CAMEO):🕵🏻Hardy Boys Book Blue Back
08 The Mystery of Cabin Island (1966-YELLOW NUMBER):🕵🏻Hardy Boys Book Blu
53 The Clue of the Hissing Serpent (1974-YN): Hardy Boys Book Blue Back
51 The Masked Monkey (1972-Red Numbered):🕵🏻Vintage Hardy Boys Book Blue-Back
