Columbia subject headings:
Capitalism--Political aspects.
Internationalism--History.
Socialism--History.
Space perception.
Universalism.
Harvard subject headings:
Capitalism--Political aspects
Internationalism--History.
Internationalism.
Socialism
Socialism--History
Socialist International (1889-1922)
Space perception
Universalism.
Princeton subject headings:
Capitalism--Political aspects.
Internationalism--History.
Socialism--History.
Space perception.
Universalism.