Columbia subject headings:
Industrial hygiene--Germany.
Iron industry and trade--Germany.
Steel industry and trade--Germany.
Harvard subject headings:
Industrial hygiene--Germany (West)--History.
Industrial safety--Germany (West)--History.
Iron industry and trade--Employees--Health and hygiene--Germany--History.
Iron industry and trade--Germany (West)--History.
Social responsibility of business--Germany--History.
Steel industry and trade--Employees--Health and hygiene--Germany--History.
Steel industry and trade--Germany (West)--History.
Princeton subject headings:
Industrial hygiene--Germany (West)--History.
Industrial safety--Germany (West)--History.
Iron industry and trade--Employees--Health and hygiene--Germany--History.
Iron industry and trade--Germany (West)--History.
Social responsibility of business--Germany--History.
Steel industry and trade--Employees--Health and hygiene--Germany--History.
Steel industry and trade--Germany (West)--History.