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In 1903 , John Charles Olmsted of Olmsted Brothers , a nationally known landscape architecture firm , recommended several changes to the park including the present name , location of the entrance , separate roads and pedestrian paths , and replacement of formal gardens with native species .
 John Charles Olmsted, Olmsted
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 John Charles Olmsted, Olmsted