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In the 19th century , a " triangle " of village sign languages developed in New England : one in Martha 's Vineyard , Massachusetts ; one in Henniker , New Hampshire , and one in Sandy River Valley , Maine .
 New England, Martha 's Vineyard, Massachusetts, Henniker, New Hampshire, Sandy River Valley, Maine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 New England, Martha 's Vineyard, Massachusetts, Henniker, New Hampshire, Sandy River Valley, Maine