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Edward Duchman Muhlenberg ( May 15 , 1831 – March 10 , 1883 ) was an American civil engineer in the railroad industry and an officer in the Union Army during the American Civil War .
 Edward, Muhlenberg, American, Union Army
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Edward, Muhlenberg, American, Union Army