Columbia subject headings:
Harvard subject headings:
Hippies--United States--History.
Radicals--United States--History--20th century.
Subculture--United States--History--20th century.
Youth International Party--History.
Youth--Political activity--United States--History--20th century.
Princeton subject headings:
Hippies--United States--History.
Radicals--United States--History--20th century.
Subculture--History--20th century.
Youth International Party--History.
Youth--Political activity--United States--History--20th century.