| Subjects term | Scope note | Archival description count | Authority record count |
|---|---|---|---|
| Marine Engine Building | 1 | 0 | |
| Marine Engineering | 1 | 0 | |
| Maritime History | 2 | 0 | |
| Mathematics | 3 | 0 | |
| Medical Education | 1 | 0 | |
| Medical Engineering | 1 | 0 | |
| Medical Research | 2 | 0 | |
| Medicine (9) | 10 | 0 | |
| Meteorology -- 19th century | 2 | 0 | |
| Middle East, Antiquities | 1 | 0 |