- Manuscripts, French2
- Manuscripts, German1
- Manuscripts, Greek1
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Hebrew4
- Manuscripts, Italian4
- Manuscripts, Latin1
- Manuscripts, Latin (Medieval and modern)8
- Manuscripts, Medieval5
- Manuscripts, Persian4
- Manuscripts, Portuguese1
- Manuscripts, Renaissance4
- Manuscripts, Turkish5
- Maps3
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Massachusetts--Boston1
- Medicine1
- Mediterranean Region1
- Mediterranean Sea1
- Meteorology1