Columbia subject headings:
Fortification--Germany--Landau in der Pfalz.
Historic buildings--Germany--Landau in der Pfalz.
Landau in der Pfalz (Germany)--Buildings, structures, etc.
Landau in der Pfalz (Germany)--History, Military.
Military architecture--Germany--Landau in der Pfalz.
Harvard subject headings:
Historic buildings--Germany--Landau in der Pfalz--History.
Landau in der Pfalz (Germany)--Buildings, structures, etc.--History.
Landau in der Pfalz (Germany)--History, Military.
Military architecture--Germany--Landau in der Pfalz--History--Pictorial works.
Military architecture--Germany--Landau in der Pfalz--History.
Princeton subject headings: