Columbia subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Lukács, György, 1885-1971--Congresses.
Harvard subject headings:
Bloch, Ernst, 1885-1977--Congresses.
Lukács, György, 1885-1971--Congresses.
Princeton subject headings:
Block, Ernst, 1885-1977--Congresses.
Lukács, György, 1885-1971--Congresses.