Columbia subject headings:
Industries--Germany--Singen am Hohentwiel--History.
Singen am Hohentwil (Germany)--Economic conditions.
Singen am Hohentwil (Germany)--History.
Singen am Hohentwil (Germany)--Social conditions.
Harvard subject headings:
Industries--Germany--Singen am Hohentwiel--History.
Singen am Hohentwiel (Germany)--Economic conditions.
Singen am Hohentwiel (Germany)--History.
Singen am Hohentwiel (Germany)--Social conditions.
Princeton subject headings:
Industries--Germany--Singen am Hohentwil--History.
Singen am Hohentwiel (Germany)--Economic conditions.
Singen am Hohentwiel (Germany)--History.
Singen am Hohentwiel (Germany)--Social conditions.