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A retrospective exhibition comprising some 200 works from across the artist 's career loaned from public and private collections was held by the National Library of Wales in 2011 to coincide with his sixtieth birthday .
 National Library of Wales
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 National Library of Wales