Encyclopedias, Almanacs, Transcripts, and Maps
- Mary Lee Jobe Akeley
- Mary Lucy Cartwright
- Mary Wortley Montagu
- Maryland Center for Investigation of Unconventional Phenomena
- Maskelyne, John Nevil (1839-1917)
- Masleh
- Mass Migration of Continental European Scientists to the U.S. and Elsewhere
- Mass of St. Secaire
- Mass Transportation
- Mass Transportation
- Masse, François (1891-?)
- Massey, Gerald (1828-1907)
- Mastering the Seas: Advances in Trigonometry and Their Impact upon Astronomy, Cartography, and Maritime Navigation
- Masters, Nancy E
- Masters, Robert E. L. (1927-)
- Mastiphal
- Material for Thought
- Materialization
- Maternal–Fetal Relationship
- Maternal–Fetal Relationship: I. Medical Aspects