Columbia subject headings:
Bayer AG--History.
Hoechst AG--History.
Pharmaceutical industry--Germany--History.
Schering AG--History.
Harvard subject headings:
Bayer AG--History.
Farbenfabriken Bayer Aktiengesellschaft
Hoechst AG
Hoechst AG--History.
Pharmaceutical industry--Germany--History.
Schering AG
Schering AG--History.
Princeton subject headings:
Bayer AG--History.
Hoechst AG--History.
Pharmaceutical industry--Germany--History.
Schering AG--History.