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Landmarks Howard County Historical Society and Museum The Howard County Museum is located on West Sycamore Street and inhabits the Seiberling Mansion , the Elliott House , as well as two historic carriage houses owned by the two families which built the two massive residences .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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