Columbia subject headings:
Harvard subject headings:
Cities and towns--Europe--History--19th century.
Cities and towns--Europe--History--20th century.
Communication--Europe--History--19th century.
Communication--Europe--History--20th century.
Transportation--Europe--History--19th century.
Transportation--Europe--History--20th century.
Urbanization--Europe--History--19th century.
Urbanization--Europe--History--20th century.
Princeton subject headings:
Cities and towns--Europe--History--19th century.
Cities and towns--Europe--History--20th century.
Communication--Europe--History--19th century.
Communication--Europe--History--20th century.
Transportation--Europe--History--19th century.
Transportation--Europe--History--20th century.
Urbanization--Europe--History--19th century.
Urbanization--Europe--History--20th century.