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2. Carbon Storage and Accumulation in United States Forest Ecosystems;Birdsey,1992
3. Employment Cost Index Historical Listing Constant-Dollar 1975–2005;[BLS] Bureau of Labor Statistics,2006
4. Constant Dollar March 2001–December 2012;[BLS] Bureau of Labor Statistics,2013
5. Consumer Price Index (All Urban Consumers, U.S. City Average, All Items);[BLS] Bureau of Labor Statistics,2013