Columbia subject headings:
Harvard subject headings:
Japan--Politics and government--1868-1912.
Socialism--Japan--Okayama-ken--History.
Working class--Japan--Okayama-ken--Political activity--History.
Princeton subject headings:
Japan--Politics and government--1868-1912.
Socialism--Japan--Okayama-ken--History.
Working class--Japan--Okayama-ken--Political activity--History.