Columbia subject headings:
Technology--Religious aspects--Christianity--History.
Work--Religious aspects--Christianity--History of doctrines--Middle Ages, 600-1500.
Harvard subject headings:
Technology--Religious aspects--Christianity--History.
Work--Religious aspects--Christianity--History of doctrines--Middle Ages, 600-1500.
Princeton subject headings:
Technology--Religious aspects--Christianity--History.
Work--Religious aspects--Christianity--History of doctrines--Middle Ages, 600-1500.