Columbia subject headings:
Harvard subject headings:
Infrastructure (Economics)--Germany--Econometric models.
Inland water transportation--Germany--Finance--Econometric models.
Input-output analysis--Germany.
Production functions (Economic theory)
Railroads--Germany--Finance--Econometric models.
Roads--Germany--Finance--Econometric models.
Princeton subject headings:
Investments--Germany.
Traffic estimations--Germany.
Transportation--Germany--Finance.