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He was also a milker , ditch-digger , janitor , recruiter for the University of Montana , and New York City subway guard , then an Encyclopædia Britannica salesman in that city , where he persuaded poor families to band together to buy the volumes .
 organization: Montana
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Montana 
Answer:
 organization: Montana