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James T. Mangan ( 1896 – 1970 ) was a famous eccentric , public relations man and best-selling author on self-help topics who publicly claimed ownership of outer space in 1948 .
 T. Mangan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 T. Mangan