351288
A 12.25 inch Clark Refractor was installed in a dome that Dr. Pritchett modeled after the Harvard College Observatory .
 Clark, Pritchett, Harvard College Observatory
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clark, Pritchett, Harvard College Observatory