Mystery

The Sign of the Crooked Arrow; Hardy Boys #28 (Used Hardcover) - Frankin W. Dixon

The Mystery of The Spiral Bridge; Hardy Boys #45 (Used Hardcover) - Frankin W. Dixon

The Secret of Wildcat Swamp; Hardy Boys #31 (Used Hardcover) - Frankin W. Dixon

The Clue in the Embers; Hardy Boys #35 (Used Hardcover) - Frankin W. Dixon

The Mystery of the Aztec Warrior; Hardy Boys #43 (Used Hardcover) - Frankin W. Dixon

The Viking Symbol Mystery; Hardy Boys #42 (Used Hardcover) - Frankin W. Dixon

Mystery of the Desert Giant; Hardy Boys #40 (Used Hardcover) - Frankin W. Dixon