Columbia subject headings:
Capitalists and financiers--Pennsylvania--History.
Cities and towns--Pennsylvania--Growth--Case studies.
Lackawanna River Valley (Pa.)--Economic conditions.
Lehigh River Valley (Pa.)--Economic conditions.
Urbanization--Pennsylvania--Case studies.
Harvard subject headings:
Capitalists and financiers--Pennsylvania--History.
Cities and towns--Pennsylvania--Growth--Case studies.
Lackawanna River Valley (Pa.)--Economic conditions.
Lehigh River Valley (Pa.)--Economic conditions.
Urbanization--Pennsylvania--Case studies.
Princeton subject headings:
Capitalists and financiers--Pennsylvania--History.
Cities and towns--Pennsylvania--Growth--Case studies.
Lackawanna River Valley (Pa.)--Economic conditions.
Lehigh Valley--Economic conditions.
Urbanization--Pennsylvania--Case studies.