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Ravenswood Park is a nature reserve in the western section of Gloucester , Massachusetts owned and managed by the Trustees of Reservations .
 Gloucester , Massachusetts, Trustees of Reservations
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gloucester , Massachusetts, Trustees of Reservations