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Fredson Thayer Bowers ( April 25 , 1905 – April 11 , 1991 ) was an American bibliographer and scholar of textual editing .
 Fredson, Bowers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fredson, Bowers