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Hamilton Jeffers was graduated from the University of California , Berkeley in 1917 , and received a doctorate in astronomy from the same institution in 1921 .
 Hamilton Jeffers, University of California , Berkeley
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hamilton Jeffers, University of California , Berkeley