The young adventurers and the Rajah's ruby /
Blyton, Enid.
Ludlow, Patricia.
Blyton, Enid.Adventure of the strange ruby.
Blyton, Enid.Riddle of the Rajah's Ruby.
London : Award Publications,
2004.
Originally published as: The adventure of the strange ruby. Brockhampton Press, 1960. Revised ed. published as: The riddle of the Rajah's Ruby.
Rubies