Columbia subject headings:
Associations, institutions, etc.--America--History--Congresses.
Associations, institutions, etc.--Europe--History--Congresses.
Associations, institutions, etc.--Political activity--America--History--Congresses.
Associations, institutions, etc.--Political activity--Europe--History--Congresses.
Political participation--America--History--Congresses.
Political participation--Europe--History--Congresses.
Pressure groups--America--History--Congresses.
Pressure groups--Europe--History--Congresses.
Harvard subject headings:
Associations, institutions, etc.--America--History--Congresses.
Associations, institutions, etc.--Europe--History--Congresses.
Associations, institutions, etc.--Political activity--America--History--Congresses.
Associations, institutions, etc.--Political activity--Europe--History--Congresses.
Political participation--America--History--Congresses.
Political participation--Europe--History--Congresses.
Pressure groups--America--History--Congresses.
Pressure groups--Europe--History--Congresses.
Princeton subject headings: