Source: Survey Of Current Business, July 1951, Pp. 27-28, For 1929 Through 1949 Data; Quarterly Summary Of Foreign Commerce Thereafter.
This NBER data series m04196 appears on the NBER website in Chapter 4 at http://www.nber.org/databases/macrohistory/contents/chapter04.html.
NBER Indicator: m04196
Release: NBER Macrohistory Database
National Bureau of Economic Research, Price Index of Exports of Domestic Merchandise for United States [M04196USM345NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M04196USM345NNBR, May 28, 2016.