- FondsButler - Samuel Butler Collection
- SeriesSection 3 (III) - Books, etc., about Samuel Butler
- Subseries3 - Box 3
- File8 - Offprints of articles by Marcus Hartog
- Item1 - 'The Fundamental Principles of Heredity', by Professor Marcus M. Hartog
- Item2 - '"Nuclear Reduction" and the Function of Chromatin', by Marcus Hartog