Columbia subject headings:
Human capital--United States.
Infrastructure (Economics)--United States--Finance.
Public investments--United States.
United States--Economic conditions--1981-2001.
Harvard subject headings:
Federal aid to research--United States
Infrastructure (Economics)--United States.
National Science Foundation (U.S.)
Public works--United States.
Princeton subject headings:
Human capital--United States.
Infrastructure (Economics)--United States--Finance.
Public investments--United States.
United States--Economic conditions--1981-2001.