Three great Hardy boys mysteries
Dixon, Franklin W.
Dixon, Franklin W.Arctic patrol mystery.
Dixon, Franklin W.Twisted claw.
Dixon, Franklin W.Secret of Pirates Hill.
London Fontana
1981
Contents: The Arctic patrol mystery. Originally published: London : Collins, 1971. - The twisted claw. Originally published: London : Collins, 1972. - The Secret of pirates hill. Originally published: London : Collins, 1972