Columbia subject headings:
Harvard subject headings:
Habsburg, House of--History--19th century--Congresses.
Imperialism and science--Europe, Eastern--History--19th century--Congresses.
Imperialism and science--Russia--History--19th century--Congresses.
Science and state--Europe, Eastern--History--19th century--Congresses.
Science and state--Russia--History--19th century--Congresses.
Science--Europe, Eastern--History--19th century--Congresses.
Science--Russia--History--19th century--Congresses.
Science--Societies, etc.--History--19th century--Congresses.
Princeton subject headings:
Czechoslovakia--Politics and government--1918-1938--Congresses.
Science--Austria--History--19th century--Congresses.
Science--Russia--History--19th century--Congresses.