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1Published 1972“…US Department of Labor; Bureau of Labor Statistics…”
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2Published n.d.“…Bureau of Labor Statistics, U.S. Department of Labor,…”
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3Published 1949.“…Department of Labor, Bureau of Labor Statistics,…”
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4Published 1972.“…U.S. Department of Labor, Bureau of Labor Statistics,…”
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5Published 1963.“…U.S. Department of Labor, Bureau of Labor Statistics,…”
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