Columbia subject headings:
Harvard subject headings:
Hamburg-Harburg (Hamburg, Germany)--History.
Hamburg-Harburg (Hamburg, Germany)--Pictorial works.
Harbors--Germany--Hamburg--History--Pictorial works.
Harbors--Germany--Hamburg--History.
Princeton subject headings:
Hamburg-Harburg (Hamburg, Germany)--History.
Hamburg-Harburg (Hamburg, Germany)--Pictorial works.
Harbors--Germany--Hamburg--History--Pictorial works.
Harbors--Germany--Hamburg--History.