The Mystery of the Moaning Cave — Robert Arthur

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Paperback editions:

  • Paperback
  • Jul-1968
  • Random House
  • ISBN: 0394814231
  • ISBN13: 9780394814230

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  • Paperback
  • May-1978
  • Random House
  • ISBN: 0394837738
  • ISBN13: 9780394837734

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Hardcover editions:

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Description
El Diablo -- The Devil! The very name of the legendary outlaw strikes fear in the hearts of California ranch owner.

Many years ago, the young El Diablo disappeared into a mountain cave, never to be seen again. But the ranchers think he may still be alive -- especially now that an eerie moaning sound is coming from his old hideout.

The Three Investigators set out in the dark of night to explore the moaning cave -- and they soon wish that they were armed with more than a flashlight!
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