- Philosophy--Collected works (136)
- Hegel, Georg Wilhelm Friedrich, 1770-1831 (21)
- Theology--Collected works (4)
- Schleiermacher, Friedrich, 1768-1834 (3)
- Philosophy (2)
- Apologetics--Middle Ages, 600-1500 (1)
- Catholic Church--Collected works (1)
- Causation (1)
- Christianity and other religions--Early works to 1800 (1)
- Descartes, René, 1596-1650--Dictionaries, indexes, etc (1)
- Economics--Collected works (1)
- Islam--Controversial literature--Early works to 1800 (1)
- Kant, Immanuel,--1724-1804 (1)
- Koran--Criticism, interpretation, etc.--Early works to 1800 (1)
- Languages--Philosophy--Collected works (1)
- Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716 (1)
- Logical positivism--Collected works (1)
- Mathematics--Collected works (1)
- Metaphysics (1)
- Montague, Richard, 1930-1971 (1)
- Ontology (1)
- Psychology--Collected works (1)
- Reason (1)
- Religions--Relations--Early works to 1800 (1)
- Schiller, Friedrich, 1759-1805 (1)
- Science--Philosophy--Collected works (1)
- Theology--Collected works--Middle Ages (1)
- Vision--Collected works (1)