Columbia subject headings:
Constitutional history--Europe--19th century--Congresses.
Europe--History--1848-1849--Congresses.
Harvard subject headings:
Constitutional history--Europe--Congresses.
Europe--History--1848-1849--Congresses.
Princeton subject headings:
Constitutional history--Europe--Congresses.
Constitutional law--Europe--Congresses.
Europe--History--1848-1871--Congresses.
Europe--Politics and government--1848-1871--Congresses.