1913 Boundaries Were Carried Through 1919. Source: Annuaire Statistique, 1935, P. 81.
This NBER data series a01213 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01213
Release: NBER Macrohistory Database
National Bureau of Economic Research, Steel Ingots and Castings Production for France [A01213FRA580NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A01213FRA580NNBR/, October 13, 2015.