The riddle of the Rajah's ruby /
Blyton, Enid.
Ludlow, Patricia.
Blyton, Enid.Adventure of the strange ruby.
Blyton, Enid.Young adventurers and the Rajah's ruby.
Worksop : Award Publications,
2009.
"... first published in Great Britain under the title The adventure of the strange ruby by the Brockhampton Press in 1960. First published by Award Publications Limited 2004 as The young adventurers and the Rajah's ruby"--T.p. verso.
Rubies