Premier supplement au répertoire des lieux de chargement et de déchargement ouverts au trafic international = First supplement to the list of ports of loading and unloading open to international trade.
League of Nations.Economic and Financial Section.
Genève : Société des Nations,
1931.
"No. officiel: C.215. M. 103. 1930. II. Supplément."
"Genève, mars 1931."
"The present Supplement replaces pages 225 to 227 of the First Edition of the volume."