Columbia subject headings:
Civilization, Western--20th century--Congresses.
Counterculture--Congresses.
Middle class--Congresses.
Harvard subject headings:
Civilization, Western--20th century--Congresses.
Counterculture--Congresses.
Dissenters--Congresses.
Middle class--Congresses.
Radicalism--Congresses
Princeton subject headings:
Civilization, Western--20th century--Congresses.
Counterculture--Congresses.
Middle class--Congresses.