Columbia subject headings:
Dyes and dyeing--Chemistry--History--Congresses.
Pharmaceutical chemistry--History--Congresses.
Harvard subject headings:
Dyes and dyeing--History--Congresses.
Materia medica--History--Congresses.
Pharmacy--History--Congresses.
Science--History--Congresses
Princeton subject headings:
Dyes and dyeing--History--Congresses.
Materia medica--History--Congresses.