Columbia subject headings:
Industrial concentration--United States.
Industrial concentration.
Industrial policy--United States.
Trusts, Industrial--United States.
Harvard subject headings:
Industrial concentration--Government policy--United States.
Industrial concentration--Government policy.
Industrial concentration--United States.
Industrial concentration.
Industrial policy--United States
Trusts, Industrial--Government policy--United States.
Trusts, Industrial--United States.
Princeton subject headings:
Industrial concentration--United States.
Industrial concentration.
Industrial policy--United States.
Trusts, Industrial--United States.