Columbia subject headings:
Harvard subject headings:
Milestones--Germany--Palatinate--History.
Palatinate (Germany)--History, Local.
Road markings--Germany--Palatinate--History.
Traffic signs and signals--Germany--Palatinate--History.
Princeton subject headings:
Milestones--Germany--Palatinate--History.
Palatinate (Germany)--History, Local.
Road markings--Germany--Palatinate--History.
Traffic signs and signals--Germany--Palatinate--History.