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In 1944 , he earned a Doctor of Philosophy degree in economics from the Catholic University of America in Washington , D.C. His thesis was entitled : " Decentralization and the Social Obligations of the Land " .
 Catholic University of America, Washington , D.C.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Catholic University of America, Washington , D.C.