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The Pool Group were virtually forgotten for more than half a century after they broke up in the mid-1930s until the early 1980s when they were rediscovered by historians of 20th century arts and cinema Members and formation The Pool Group was launched in 1927 , from Riant Chateau , Territet , Switzerland and consisted of Bryher , Kenneth Macpherson and Hilda Doolittle ( better known by her initials , H.D. ) .
 Bryher, Kenneth Macpherson, Hilda Doolittle, H.D.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bryher, Kenneth Macpherson, Hilda Doolittle, H.D.