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Plot introduction Willis imagines a near future ( first introduced in her 1982 story " Fire Watch " and featured in two of her previous novels : Doomsday Book and To Say Nothing of the Dog ) in which historian s conduct field work by traveling into the past as observers .
 Willis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Willis