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Historic resources in Aitkin County were identified in a " Multiple Resources Area " study , leading to several properties being listed on the NRHP .
 organization: Historic; location: Aitkin
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: Historic, Aitkin 
Answer:
 organization: Historic; location: Aitkin