Columbia subject headings:
Apologetics--Early works to 1800.
Wealth--Religious aspects--Christianity--Early works to 1800.
Harvard subject headings:
Apologetics--Early works to 1800
Clement, of Alexandria, Saint, approximately 150-approximately 215
Theology, Doctrinal--History--Early church, ca. 30-600.
Wealth--Religious aspects--Christianity--Early works to 1800.
Princeton subject headings: