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Alfred H. Conrad ( 2 January 1924 – 18 October 1970 ) was a distinguished and popular professor of economics at Harvard University and City College of New York .
 Alfred, Conrad, Harvard University, City College of New York
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alfred, Conrad, Harvard University, City College of New York