Columbia subject headings:
Counter-Reformation--Germany--Westphalia--Sources.
Popes--Correspondence.
Reformation--Germany--Westphalia--Sources.
Westphalia (Germany)--Church history.
Harvard subject headings:
Counter-Reformation--Germany--Westphalia--Sources.
Popes--Correspondence
Reformation--Germany--Westphalia--Sources.
Westphalia (Germany)--Church history.
Princeton subject headings:
Counter-Reformation--Germany--Westphalia--Sources.
Popes--Correspondence.
Reformation--Germany--Westphalia--Sources.
Westphalia (Germany)--Church history.