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totalt 3 träffar
Beyond Mammoth Cave
häftad,
2000,
Engelska,
ISBN 9780809323463
In this volume, James D. Borden and Roger W. Brucker provide an account of the discoveries, including that of Roppel Cave, that made Kentucky's Mammoth Cave three times longer than …
The Longest Cave
häftad,
1987,
Engelska,
ISBN 9780809313228
In 1925 the geological connection between Flint Ridge and Mammoth Cave was proved when dye placed in a Flint Ridge spring showed up in Echo River at Mammoth Cave. That tantalizing …