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Robert H. " Three-Fingered " Birch ( c. 1827 – c. 1866 ) was a 19th-century American adventurer , soldier and prospector .
 H., Birch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 H., Birch