Columbia subject headings:
Pharmaceutical policy--Germany--North Rhine-Westphalia--History.
Pharmaceutical policy--Germany--Prussia--History.
Trade regulation--Germany--History.
Harvard subject headings:
Pharmaceutical policy--Germany--North Rhine-Westphalia--History.
Pharmaceutical policy--Germany--Prussia--History.
Trade regulation--Germany--History.
Princeton subject headings:
Drugs--Germany--North Rhine-Westphalia--State supervision.
Drugs--Germany--Prussia--State supervision.
Pharmaceutical policy--Germany--North Rhine-Westphalia.
Pharmaceutical policy--Germany--Prussia.