27 The Secret of Skull Mountain (1966-YN):🕵🏻Vintage Hardy Boys Book Blue-
23 The Melted Coins (1970-RN):🕵🏻Vintage Hardy Boys Book Blue-Back
25 The Secret Panel (1946/1969-RN):🕵🏻Vintage Hardy Boys Book Blue-Back
26 The Phantom Freighter (1947/1970-RN):🕵🏻Vintage Hardy Boys Book Blue-Back
05 Hunting for Hidden Gold (1963):🕵🏻Vintage Hardy Boys Book Blue-Ba
04 The Missing Chums (1962):🕵🏻Vintage Hardy Boys Book Blue-Back
03 The Secret of the Old Mill (1962-YN):🕵🏻Vintage Hardy Boys Book Blue-Ba
34 The Hooded Hawk Mystery (1954):🕵🏻Hardy Boys Book (Brown) Blue-Back
13 The Mark on the Door (1967-RL):🕵🏻Vintage Hardy Boys Book (var.) Blue-Back
21 The Clue of the Broken Blade (1942): var. Hardy Boys Book Blue-Back
The Hardy Boys Detective Handbook🕵🏻Vintage Hardy Boys Book Blue-Back
The Hardy Boys Volume 1 The Tower Treasure
04 The Missing Chums (1962-YN):🕵🏻Vintage Hardy Boys Book Blue-Back
06 The Shore Road Mystery (1928):🕵🏻Vintage Hardy Boys Book Blue-Back
08 The Mystery of Cabin Island (1942):🕵🏻Vintage Hardy Boys Book Blue-Back
09 The Great Airport Mystery (1961):🕵🏻Vintage Hardy Boys Book Blue-Back
12 Footprints Under the Window (1933):🕵🏻Vintage Hardy Boys Book Blue-Back
12 Footprints Under the Window (1965):🕵🏻Vintage Hardy Boys Book Blue-Back
14 The Hidden Harbor Mystery (Blue Bar):🕵🏻Vintage Hardy Boys Book Blue-Back
15 The Sinister Signpost (Blue Bar):🕵🏻Vintage Hardy Boys Book Blue-Back
