Columbia subject headings:
Harvard subject headings:
Christianity--Europe, Central--Congresses.
Christianity--Europe, Eastern--Congresses.
Europe, Central--Church history--19th century--Congresses.
Europe, Eastern--Church history--19th century--Congresses.
Princeton subject headings:
Christianity--Europe, Central--Congresses.
Christianity--Europe, Eastern--Congresses.
Europe, Central--Church history--19th century--Congresses.
Europe, Eastern--Church history--19th century--Congresses.