Columbia subject headings:
Harvard subject headings:
Christianity and other religions--Islam--Early works to 1800
Christians--Islamic Empire--History--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800
Islamic Empire--Ethnic relations--Early works to 1800.
Islamic Empire--Politics and government--Early works to 1800.
Princeton subject headings:
Christianity and other religions--Islam--Early works to 1800.
Christians--Islamic Empire--History--Early works to 1800.
Islam--Relations--Christianity--Early works to 1800.
Islamic Empire--Ethnic relations--Early works to 1800.
Islamic Empire--Politics and government--Early works to 1800.