Columbia subject headings:
Harvard subject headings:
Apologetics--Early works to 1800
Christianity--Early works to 1800
Orthodox Eastern Church--Doctrines--Early works to 1800.
Philosophy
Theology, Doctrinal--Early works to 1800.
Princeton subject headings:
Apologetics--Early works to 1800.
Orthodox Eastern Church--Doctrines--Early works to 1800.
Philosophy.
Theology, Doctrinal--Early works to 1800.