Columbia subject headings:
Harvard subject headings:
Graffiti--Congresses.
History--Sources--Congresses.
Inscriptions--Congresses.
Paleography--Congresses.
Princeton subject headings:
Graffiti--Congresses.
Graffiti--Italy--Rome--Congresses.
Graffiti--Psychological aspects--Congresses.
Inscriptions, German--Congresses.
Inscriptions, Latin--Congresses.
Inscriptions, Russian--Congresses.
Mural painting and decoration--Congresses.
World War, 1939-1945--Graffiti--Congresses.
World War, 1939-1945--Prisoners and prisons, German--Congresses.