Encyclopedias, Almanacs, Transcripts, and Maps
- Merton, Robert
- Meselson, Matthew Stanley (1930- )
- Mesites and Roatelos: Mesitornithidae
- Mesmerism: A Theory of the Soul
- Mesoamerican Burrowing Toads: Rhinophrynidae
- Mesophilic Bacteria
- Mesoscopic Systems
- Mesoscopic Systems
- Metachromatic Leukodystrophy
- Metagnome
- Metagnomy
- Metagraphology
- Metal Bending
- Metal Fatigue
- Metal Fatigue
- Metal Production
- Metal Production
- Metallurgy through the Ages
- Metamorphic Grade
- Metamorphic Grade