Volunteers in the U.S.: who donates the time?
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Bureau of Labor Statistics.
D000367:Age Factors; D003625:Data Collection; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D012737:Sex Factors; D014481:United States; D014838:Volunteers / Q000706:statistics & numerical data*