Columbia subject headings:
Imperialism--Congresses.
Racism--Congresses.
Social classes--Congresses.
Harvard subject headings:
Conference papers and proceedings
Essays
Europe--Colonies--Economic aspects--Congresses.
Europe--Colonies--Political aspects--Congresses.
Europe--Colonies--Race relations--Congresses.
Europe--Colonies--Social aspects--Congresses.
Imperialism--Congresses
Racism--Congresses
Social classes--Congresses
Princeton subject headings:
Imperialism--Congresses.
Racism--Congresses.
Social classes--Congresses.