Columbia subject headings:
Employee rights--United States--Case studies.
Industrial hygiene--United States--Case studies.
Industrial relations--United States--Case studies.
Industrial safety--United States--Case studies.
Harvard subject headings:
Employee rights--United States--Case studies.
Industrial hygiene--United States--Case studies.
Industrial relations--United States--Case studies
Industrial safety--United States--Case studies.
Princeton subject headings:
Case studies.
Employee rights--United States--Case studies.
Industrial hygiene--United States--Case studies.
Industrial relations--United States--Case studies.
Industrial safety--United States--Case studies.