Progressive codification of international law : observations by the governments : series.
League of Nations.
Geneva : League of Nations,
1931.
At head of title: League of Nations.
Issued with the following document numbers: Series 1. May 30th, 1931. (A.12.1931.V); Series 2. July 27th, 1931. (A.12(a).1931.V); Series 3. August 31st, 1931. (A.12(b).1931.V).
International law
Progressive codification of international law.