Columbia subject headings:
Fortification--France--Pictorial works.
Franco-Prussian War, 1870-1871--Graffiti.
Graffiti--France--Metz.
Graffiti--France--Strasbourg.
Graffiti--France--Thionville.
World War, 1914-1918--Graffiti.
World War, 1939-1945--Graffiti.
Harvard subject headings:
Fortification--France--Pictorial works.
Franco-Prussian War, 1870-1871--Graffiti.
World War, 1914-1918--Graffiti.
World War, 1939-1945--Graffiti.
Princeton subject headings:
Fortification--France--Pictorial works.
Franco-Prussian War, 1870-1871--Graffiti.
World War, 1914-1918--Graffiti.
World War, 1939-1945--Graffiti.