Columbia subject headings:
Harvard subject headings:
Drugs--Germany--History--Congresses.
Drugs--History--Congresses.
Pharmacy--Germany--History--Congresses.
Pharmacy--History--Congresses.
Princeton subject headings:
Drugs--Germany--History--Congresses.
Drugs--History--Congresses.
Pharmacy--Germany--History--Congresses.
Pharmacy--History--Congresses.