The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest.
- Dewey Decimal: [Fic]
- Language: eng
- Physical Description: 120 p. : ill. ; 22 cm.
- Edition Info: (pbk.)
- Rubies -- Juvenile fiction
- Precious stones -- Collection and preservation -- Juvenile fiction
- Brothers and sisters -- Juvenile fiction
- Boxcar children (Fictitious characters) -- Juvenile fiction
- Orphans -- Juvenile fiction
- Mystery fiction
- Rubies -- Fiction
- Precious stones -- Collection and preservation -- Fiction
- Brothers and sisters -- Fiction
- Boxcar children (Fictitious characters) -- Fiction
- Orphans -- Fiction
- Mystery and detective stories
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