Source: U.S. Bureau of Economic Analysis
Release: Gross Domestic Product
BEA Account Code: Y694RC
For more information about this series, please see http://www.bea.gov/national/."
U.S. Bureau of Economic Analysis, Gross Domestic Product: Research and Development [Y694RC1Q027SBEA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Y694RC1Q027SBEA, March 19, 2018.