Columbia subject headings:
Osnabrück (Ecclesiasstical principality)--History--Sources.
Peace of Westphalia--History--Sources.
Thirty Years' War, 1618-1648.
Harvard subject headings:
Osnabrück (Ecclesiastical principality)--History--Sources.
Osnabrück (Germany : Landkreis)--History--Sources.
Thirty Years' War, 1618-1648
Thirty Years' War, 1618-1648--History--Sources.
Princeton subject headings:
Osnabrück (Ecclesiastical principality)--History--Sources.
Osnabrück (Germany : Landkreis)--History--Sources.
Thirty Years' War, 1618-1648--History--Sources.