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The Hardys team up with a team of engineers to discover how water is disappearing from Bayport's new reservoir near Skull Mountain.

The Secret of Skull Mountain 1986, Armada, London

ISBN-13: 9780006926559

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Secret of Skull Mountain 1977, HarperCollins Distribution Services

ISBN-13: 9780001605411

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The Secret of Skull Mountain 1975, Grosset & Dunlap

ISBN-13: 9780448189277

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Secret of Skull Mountain 1966, TBS The Book Service Ltd

ISBN-13: 9780356013671

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The Secret of Skull Mountain 1948, Grosset & Dunlap, New York, NY

ISBN-13: 9780448089270

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