Black and White Picture/photo (Caves): Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

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Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

Cave mouth, where strong winds equalize pressure between inside outside. Wind Cave National Park, South Dakota, USA.

Photo ID# wica0579-bw

Location: Wind Cave

Subjects: Caves, Geology, Inside, Intimate Landscapes, Nobody, Wilderness

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