Columbia subject headings:
Dissenters, Religious--History--Congresses.
Persecution--History--Congresses.
Religious refugees--History--Congresses.
Harvard subject headings:
Dissenters, Religious--Congresses.
Persecution--History--Congresses.
Religious refugees--Congresses.
Princeton subject headings:
Dissenters, Religious--Congresses.
Persecution--History--20th century--Congresses.
Religious refugees--Congresses.