Subject
- Martín, de Porres, Saint, 1579-16391
- Mathematicians4
- Mayer, Maria Goeppert, 1906-19721
- Mechanical engineers1
- Medical botanists2
- Medical scientists1
- Medical students1
- Medicine1
- Medicine, Persian4
- Metric system3
- Mexico11
- Microbiologists3
- Mommsen, Theodor, 1817-19031
- Monaco4
- Monks1
- Monuments3
- Mosdossy, Imre von, 1904-19951
- Muslim scholars4
- Mutsu (Ship)2
- National socialism1