Columbia subject headings:
Frankfurt (Oder) (Germany)--Economic conditions.
Frankfurt (Oder) (Germany)--Social conditions.
Germany--Social conditions--19th century.
Potsdam (Germany)--Economic conditions.
Potsdam (Germany)--Social conditions.
Harvard subject headings:
Frankfurt (Oder) (Germany)--Economic conditions.
Frankfurt (Oder) (Germany)--Social conditions.
Germany--Social conditions--19th century.
Potsdam (Germany)--Economic conditions.
Potsdam (Germany)--Social conditions.
Princeton subject headings:
Frankfurt (Oder) (Germany)--Economic conditions.
Frankfurt (Oder) (Germany)--Social conditions.
Germany--Social conditions--19th century.
Potsdam (Germany)--Economic conditions.
Potsdam (Germany)--Social conditions.