About Tom Swift Among the Diamond Makers by Victor Appleton
From the publisher's feed
Tom Swift flies his airship to the mountain tops of Colorado to seek for the secret of the Diamond Makers: criminal scientists who have figured out the formula of manufacturing a limitless fortune in…
diamonds. But these rogues will stop at nothing to keep their secret. Tom & friends are soon captured and left to die in a collapsing mountain. (Summary by Wikipedia)
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