Well done, Secret Seven ; Secret Seven on the trail /
Blyton, Enid.
Blyton, Enid.Secret Seven on the trail.
Lucas, Derek.
[Sevenoaks] : Knight,
1987.
Well done, Secret Seven. Originally published: Leicester : Brockhampton, 1951 -- Secret Seven on the trail. Originally published: Leicester : Brockhampton, 1952.