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The significance of the preserve was discovered in 1994 , when speleologist Dave Hubbard inventoried the cave in response to local concerns ; it was in response to these that the state took control of the site in 2005 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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