Columbia subject headings:
Industries--Japan--Yamagata-ken--History--19th century.
Industries--Japan--Yamagata-ken--History--20th century.
Yamagata-ken (Japan)--Economic conditions--19th century.
Yamagata-ken (Japan)--Economic conditions--20th century.
Harvard subject headings:
Industries--Japan--Yamagata-ken--History--1868-
Yamagata-ken (Japan)--Economic conditions--1868-
Princeton subject headings:
Industries--Japan--Yamagata-ken--History--1868-.
Yamagata-ken (Japan)--Economic conditions--1868-.