Columbia subject headings:
Harvard subject headings:
Mercury--Toxicology--Japan--Minamata-shi--History--20th century.
Minamata-shi (Japan)--History.
Princeton subject headings:
Mercury--Toxicology--Japan--Minamata-shi--History--20th century.
Minamata-shi (Japan)--Social conditions--20th century.
Social stratification--Japan.