Columbia subject headings:
Harvard subject headings:
Highway planning--Developing countries--Congresses.
Highway planning--Developing countries.
Highway planning--United States
Highway planning--United States--Congresses.
Transportation--Developing countries--Planning--Congresses.
Transportation--Developing countries--Planning.
Transportation--United States--Planning
Transportation--United States--Planning--Congresses
Princeton subject headings:
Highway planning--Developing countries--Congresses.
Highway planning--United States--Congresses.
Transportation--Developing countries--Planning--Congresses.
Transportation--United States--Planning--Congresses.