Columbia subject headings:
Harvard subject headings:
Internal security--Japan--Hokkaido--History.
Police--Complaints against--Japan--Hokkaido--History.
Socialists--Japan--Hokaido--Political activity--History.
hokkaito (Japan)--Social conditions.
Princeton subject headings:
Hokkaido (Japan)--Social conditions.
Internal security--Japan--Hokkaido--History.
Police--Japan--Hokkaido--Complaints against--History.
Socialists--Japan--Hokaido--Political activity--History.