Columbia subject headings:
Harvard subject headings:
Islam--Doctrines--Early works to 1800
Islamic philosophy--Early works to 1800.
Ismailites--Early works to 1800.
Princeton subject headings:
Islam--Doctrines--Early works to 1800.
Islamic philosophy--Early works to 1800.
Islamic philosophy--Greek influences.
Ismailites--Early works to 1800.