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A cave surveyor, Tony Akers, used a tape measure to record the depth of a pit cave in Alabama, USA. (Image : Chuck Perkins) |
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Measuring a bearing in the 770 Pit, Carter County, Kentucky. (Image : Jeremy Chapman) |
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Surveys of cave animals and other features is also undertaken by experts on carefully removed samples. (Image : John Lovaas) |
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A cave surveyor's field note book. (Image : Carleton Bern) |
