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Crow Butte is a uranium mining operation located in Dawes County , Nebraska , U.S.A. Crow Butte is a roll-front uranium deposit discovered in 1980 .
 Dawes County, Nebraska, U.S.A.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dawes County, Nebraska, U.S.A.