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The forest preserve was established during the Great Depression , when work crews from the Civilian Conservation Corps and the Works Progress Administration built many of the structures still in use today .
 Civilian Conservation Corps, Works Progress Administration
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Civilian Conservation Corps, Works Progress Administration