Columbia subject headings:
Economic zoning--United States--Congresses.
Regional economics--Congresses.
Regional planning--United States--Congresses.
United States--Economic conditions--Congresses.
Harvard subject headings:
Economic zoning--United States--Congresses.
Regional economics--Congresses.
Regional planning--United States--Congresses.
United States--Economic conditions--Congresses.
Princeton subject headings:
Economic zoning--United States--Congresses.
Regional economics--Congresses.
Regional planning--United States--Congresses.
United States--Economic conditions--Congresses.