Columbia subject headings:
Harvard subject headings:
Cities and towns--Germany--Ludwigshafen am Rhein--Growth.
City planning--Germany--Ludwigshafen am Rhein--History.
Ludwigshafen am Rhein (Germany)--History.
Princeton subject headings:
Cities and towns--Germany--Ludwigshafen am Rhein--Growth.
City planning--Germany--Ludwigshafen am Rhein--History.
Ludwigshafen am Rhein (Germany)--History.