Columbia subject headings:
Inland navigation--Economic aspects--Europe--History--19th century.
Inland water transportation--Economic aspects--Europe--History--19th century.
Harvard subject headings:
Inland navigation--Europe--Economic aspects.
Inland water transportation--Europe--Economic aspects.
Princeton subject headings:
Inland navigation--Europe--Economic aspects--History--19th century.
Inland water transportation--Europe--Economic aspects--History--19th century.