The Castle Conundrum by Dixon, Franklin W.

The Castle Conundrum (The Hardy Boys #168)

'The Hardy Boys: The Secret Panel' By Franklin W. Dixon (Paperback)

The Hardy Boys: #168 The Castle Co... by Dixon, Franklin W. Paperback / softback

Blood Sport, Hardy Boys Casefiles #117, Franklin W. Dixon, Paperback, 1996

The Caribbean Cruise Caper Paperback Franklin W. Dixon

The End of the Trail Paperback Franklin W. Dixon

Robot Rumble (Hardy Boys: The Secret Files) by Dixon, Franklin W. [Paperback]