- SammlungC4 - Andrew Inglis Clark Collection
- SerieF - Essays and Speeches
- ObjektEssays : Philosophical
- Objekt15 - Relations of morality and religion under paganism and under Christianity.
- Objekt16a - Influence of Christianity on morals and civilisation
- Objekt16b - The relations of religion and morality under paganism and under Christianity
- Objekt17 - The basis of morality
- Objekt18-1 - Theism: a synthetic necessity of scientific thought
- Objekt18-2 - The basis of morality.
- Objekt18-3 - Immortality
- Objekt18-4 - The benefit of periodic religious exercises
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