Columbia subject headings:
Harvard subject headings:
Chemistry--Germany--History--20th century.
Chemistry--Germany--Societies, etc.--History--20th century.
Deutsche Chemische Gesellschaft--History--20th century.
Pflücke, Maximilian, 1889-1965.
Pietsch, Erich, 1902-1979.
Princeton subject headings:
Chemistry--Germany--History--20th century.
Chemistry--Germany--Societies, etc.--History--20th century.
Deutsche Chemische Gesellschaft--History--20th century.
Pflücke, Maximilian, 1889-1965.
Pietsch, Erich, 1902-1979.