Columbia subject headings:
Cities and towns--Germany--Growth--History.
Industries--Germany--History.
Investments--Germany.
Urbanization--Germany--History--19th century.
Urbanization--Germany--History--20th century.
Harvard subject headings:
Germany--Economic conditions--19th century--Congresses.
Germany--Economic conditions--20th century--Congresses.
Infrastructure (Economics)--Germany--History--Congresses.
Municipal finance--Germany--History--Congresses.
Public investments--Germany--History--Congresses.
Princeton subject headings: