Columbia subject headings:
Architecture--Belgium--Mons--Pictorial works.
Mons (Belgium)--Buildings, structures, etc.--Pictorial works.
Mons (Belgium)--History.
Monuments--Belgium--Mons--Pictorial works.
Harvard subject headings:
Princeton subject headings:
Architecture--Belgium--Mons.
Mons (Belgium)--Buildings, structures, etc.
Mons (Belgium)--History.