Encyclopedias, Almanacs, Transcripts, and Maps
- Marjorie Lee Browne
- Mark Catesby
- Mark Kac
- Mark Probert Memorial Foundation
- Mark Steven Ptashne
- Market Theory
- Markov (Georgi) Murder Investigation
- Marlins
- Marlins
- Marmosets and Tamarins
- Marmosets and Tamarins
- Marmosets, Tamarins, and Goeldi's Monkey: Callitrichidae
- Marmots
- Marmots
- Marriott, William S. (ca. 1910)
- Marryat, Florence (1837-1899)
- Mars Pathfinder
- Mars Pathfinder
- Mars, Face on
- Mars, Louis (1906-)