Columbia subject headings:
Europe, Eastern--Church history--Congresses.
Persecution--Europe, Eastern--History--Congresses.
Religious refugees--Europe, Eastern--History--Congresses.
Harvard subject headings:
Emigration and immigration--Religious aspects
Europe, Eastern--Church history--Congresses.
Persecution--Europe, Eastern--History--Congresses.
Religious refugees--Europe, Eastern--History--Congresses.
Princeton subject headings:
Europe, Eastern--Church history--Congresses.
Persecution--Europe, Eastern--History--Congresses.
Religious refugees--Europe, Eastern--History--Congresses.