Columbia subject headings:
Philosophy, Modern--18th century--Congresses.
Philosophy, Modern--19th century--Congresses.
Science--Philosophy--History--Congresses.
Harvard subject headings:
Philosophy, Modern--18th century--Congresses.
Philosophy, Modern--19th century--Congresses.
Science--Philosophy--History--Congresses.
Princeton subject headings:
Philosophy, Modern--History.
Science--Europe--History.
Science--Philosophy--History.
Socialism--History--19th century.