Columbia subject headings:
Minorities--Congresses.
Persecution--Europe--Congresses.
Religious tolerance--Congresses.
Religious tolerance--Europe--Congresses.
Harvard subject headings:
Freedom of religion--Europe--Congresses.
Minorities--Congresses.
Persecution--Europe--Congresses.
Religious tolerance--Congresses.
Religious tolerance--Europe--Congresses.
Princeton subject headings:
Freedom of religion--Europe--Congresses.
Minorities--Congresses.
Persecution--Europe--Congresses.
Religious tolerance--Congresses.
Religious tolerance--Europe--Congresses.