Columbia subject headings:
Contracts, Maritime--Germany--History--1918-1933.
Freight and freightage--Germany--History--1918-1933.
Shipping--Germany--History--1918-1933.
Harvard subject headings:
Contracts, Maritime--Germany--History--1918-1933.
Freight and freightage--Germany--History--1918-1933.
Shipping--Germany--History--1918-1933.
Princeton subject headings: