Columbia subject headings:
Bridges--Delaware River (N.Y.-Del. and N.J.)--Periodicals.
Toll bridges--New Jersey--Periodicals.
Toll bridges--Pennsylvania--Periodicals.
Harvard subject headings:
Princeton subject headings:
Bridges--Delaware River (N.Y.-Del. and N.J.)--Periodicals.
Toll bridges--New Jersey--Periodicals.
Toll bridges--Pennsylvania--Periodicals.