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Marion Brooks Natural Area , known for its large stand of White Birch , was formerly known as Paige Run Natural Area ; in 1975 it was renamed for Marion E. Brooks , a pioneering environmentalist from Elk County .
 Elk
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Elk