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Trixie Belden and the Mystery at Bob-White Cave (edition 1977)
Trixie Belden and the Mystery at Bob-White Cave by Kathryn Kenny
References to this work on external resources.
Wikipedia in English
While vacationing at her uncle's lodge in the Ozark Mountains, Trixie and the Bob-Whites explore caves looking for the ghost cave fish, a rare species wanted by a national science magazine.
(summary from another edition)
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