Columbia subject headings:
Ostwald, Wilhelm, 1853-1932.
Science--Philosophy.
Harvard subject headings:
Ostwald, Wilhelm, 1853-1932--Congresses.
Ostwald, Wilhelm, 1853-1932.
Science--Philosophy
Science--Philosophy--Congresses
Princeton subject headings:
Ostwald, Wilhelm, 1853-1932--Congresses.
Science--Philosophy--Congresses.