Columbia subject headings:
Harvard subject headings:
Federal aid to transportation--United States.
Highway law--United States.
Local transit--Law and legislation--United States
Pipelines--Law and legislation--United States.
Railroad law--United States.
Transportation, Automotive--Law and legislation--United States.
Princeton subject headings:
Federal aid to transportation--United States.
Highway law--United States.
Local transit--Law and legislation--United States.
Transportation, Automotive--Law and legislation--United States.