Columbia subject headings:
Presidents--United States--Staff.
Science and state--United States.
Scientists in government--United States.
Technology and state--United States.
Harvard subject headings:
Presidents--United States--Staff
Science and state--United States.
Scientists in government--United States.
Technology and state--United States.
Princeton subject headings:
Presidents--United States--Staff.
Science and state--United States.
Scientists in government--United States.
Technology and state--United States.