Columbia subject headings:
Harvard subject headings:
Industrial hygiene--Law and legislation--United States
Industrial safety--Law and legislation--United States
Safety consultants--Legal status, laws, etc.--United States.
United States. Occupational Safety and Health Administration--Management.
Princeton subject headings:
Industrial hygiene--Law and legislation--United States.
Industrial safety--Law and legislation--United States.
Safety consultants--Legal status, laws, etc.--United States.
United States. Occupational Safety and Health Administration--Management.