Columbia subject headings:
Church history--Middle Ages, 600-1500.
Crusades--Second, 1147-1149.
Germany--Politics and government--1138-1254.
Papacy--History.
Sorbs--History.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Crusades--Second, 1147-1149
Germany--Politics and government--1138-1254
Papacy--History
Sorbs--History.
Princeton subject headings:
Church history--Middle Ages, 600-1500.
Crusades--Second, 1147-1149.
Germany--Politics and government--1138-1254.
Papacy--History.
Sorbs--History.