Columbia subject headings:
Germany--History--Ludwig IV, 1314-1347--Sources.
Ludwig IV, Holy Roman Emperor, 1282?-1347.
Harvard subject headings:
Germany--History--Ludwig IV, 1314-1347--Sources.
Ludwig IV, Holy Roman Emperor, 1282?-1347.
Princeton subject headings:
Germany--History--Ludwig IV, 1314-1347--Sources.
Ludwig IV, Holy Roman Emperor, 1282?-1347.