Columbia subject headings:
Regional economics--Mathematical models.
Regional planning--Mathematical models.
United States--Economic conditions--1971-1981--Mathematical models.
Harvard subject headings:
Regional economics--Econometric models.
Regional economics--Mathematical models.
Regional planning--Econometric models.
Regional planning--Mathematical models.
United States--Economic conditions--1971-1981--Econometric models.
United States--Economic conditions--1971-1981--Mathematical models.
Princeton subject headings:
Regional economics--Mathematical models.
Regional planning--Mathematical models.
United States--Economic conditions--1971---Mathematical models.