Institution
- Lycée Français de New York1
- M and M TV Clinic1
- M. Day Consulting1
- MIT Center for Cancer Research1
- MSU/NIH Mass Spectrometry Facility1
- Macalester College1
- Magnavox Corporation1
- Magnolia Petroleum Company1
- Magyar Tudományos Akadémia1
- Mallinckrodt Chemical Works (Saint Louis, Mo.)1
- Manchester College1
- Manhattan College1
- Marine Biological Laboratory (Woods Hole, Mass.)1
- Marshall University1
- Martin Marietta Corporation1
- Mary Washington College1
- Mass Spectrometry Data Center, National Institute of Standards and Technology, United States Department of Commerce1
- Massachusetts Institute of Technology Practice School 1
- Massachusetts Institute of Technology. Radiation Laboratory1
- Mayfield High School1