National Bureau of Economic Research (NBER)

Founded in 1920, the National Bureau of Economic Research is a private, nonprofit, nonpartisan research organization dedicated to promoting a greater understanding of how the economy works. The Penn World Tables (country-level comparative indicators, 1950-2002) are here, along with the NBER Macrohistory database, industry data, international trade data, and other time series, and special topic datasets, mostly focusing on the United States.

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Data Access: 

Freely available data on internet.