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Imperial Reckoning : The Untold Story of Britain 's Gulag in Kenya written by Caroline Elkins , published by Henry Holt , won the 2006 Pulitzer Prize for General Non-Fiction .
 Caroline Elkins, Henry Holt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Caroline Elkins, Henry Holt