Columbia subject headings:
Chemistry--History--Congresses.
Ihde, Aaron J. (Aaron John), 1909-2000.
Harvard subject headings:
Chemistry--History--Congresses.
Ihde, Aaron J. (Aaron John), 1909-2000.
Princeton subject headings:
Chemistry--History--Congresses.
Ihde, Aaron J. (Aaron John), 1909-2000.