Columbia subject headings:
Communication and traffic--United States.
Inland navigation--United States.
Railroad law.
Railroads--United States.
Transportation--United States.
Harvard subject headings:
Communication and traffic--United States
Inland navigation--United States.
Railroad law.
Railroads--United States
Transportation--United States
Princeton subject headings:
Communication and traffic--United States.
Inland navigation--United States.
Railroad law.
Railroads--United States.
Transportation--United States.