The Data Represent Manufactured Iron And Steel Products Including Machinery And Vehicles. Source: Unpublished Tabulation. For A Description And Coverage Of This Series, See Robert E. Lipsey, Price And Quantity Trends In The Foreign Trade Of The United States, NBER, 1963, Pp.289-295.
This NBER data series q04211 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: q04211
Release: NBER Macrohistory Database
National Bureau of Economic Research, Price Index of Exports of Iron and Steel for United States [Q04211USQ324NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/Q04211USQ324NNBR/, August 3, 2015.