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He worked on a freighter on the American Export Business Lines and riverboats , served as vice president at a Dubuque clothing manufacturer which had been bought by his great-grandfather ( who worked his way from the bottom to the top of the company in a true Horatio Alger kind of story ) .
 Dubuque, Horatio Alger
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dubuque, Horatio Alger