Columbia subject headings:
Industrial hygiene--History--Congresses.
Industrial hygiene--Social aspects--Congresses.
Medicine, Industrial--History--Congresses.
Medicine, Industrial--Social aspects--Congresses.
Harvard subject headings:
Industrial hygiene--History--Congresses.
Industrial hygiene--Social aspects--Congresses.
Medicine, Industrial--History--Congresses.
Medicine, Industrial--Social aspects--Congresses.
Princeton subject headings:
Industrial hygiene--History--Congresses.
Industrial hygiene--Social aspects--Congresses.
Medicine, Industrial--History--Congresses.
Medicine, Industrial--Social aspects--Congresses.