Source: Director Generale Des Douanes, "Documents Statistique Sur Le Commerce De La France, 1921/1923; Name Then Changes To"Statiste Que Mensuelle Du Commerce Exterieur De La France".
This NBER data series m03027 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03027
Release: NBER Macrohistory Database
National Bureau of Economic Research, Vessels Entered for France [M03027FRM561NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03027FRM561NNBR, February 11, 2016.