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Dudley Observatory is an astronomical observatory located in Schenectady , New York , United States .
 Dudley, Schenectady , New York, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dudley, Schenectady , New York, United States