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Home » A geological-speleological expedition in China » A rock window at the bottom of a huge doline near the unexplored Boniukeng Cave. » A rock window at the bottom of a huge doline near the unexplored Boniukeng Cave.

A rock window at the bottom of a huge doline near the unexplored Boniukeng Cave.

A rock window at the bottom of a huge doline near the unexplored Boniukeng Cave.

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