Columbia subject headings:
Harvard subject headings:
Aomori-ken (Japan)--History.
Hokkaido (Japan)--History.
Roads--Japan--Aomori-ken--History.
Roads--Japan--Hokkaido--History.
Princeton subject headings:
Aomori-ken (Japan)--History.
Hokkaido (Japan)--History.
Roads--Japan--Aomori-ken--History.
Roads--Japan--Hokkaido--History.