Columbia subject headings:
Crusades--Second, 1147-1149.
Crusades--Third, 1189-1192.
Ismailites--Syria.
Harvard subject headings:
Crusades--Second, 1147-1149
Crusades--Third, 1189-1192
Ismailites--Syria.
Princeton subject headings:
Crusades--Second, 1147-1149.
Crusades--Third, 1189-1192.
Ismailites--Syria.