Columbia subject headings:
Harvard subject headings:
Elbe (Germany)--History.
River boats--Germany--Elbe--History--Pictorial works.
River boats--Germany--Saale River Watershed--History--Pictorial works.
Saale River Watershed (Germany)--History.
Shipping--Germany--Elbe--History--Pictorial works.
Shipping--Germany--Saale River Watershed--History--Pictorial works.
Princeton subject headings:
Elbe River (Czech Republic and Germany)--History.
Saale River (Germany)--History.
Shipping--Germany.