Institution
- McGovern Institute for Brain Research at MIT1
- McMillan Science Associates 1
- Medical College of Pennsylvania1
- Medical College of Virginia1
- Medical Research Council (Great Britain)1
- Meharry Medical College1
- Melpar, Inc.1
- Merocel Corporation1
- Metal Box Company1
- Metal Hydrides, Inc.1
- Metcalf & Eddy1
- Metropolitan State University1
- Michigan Molecular Institute1
- Microma Corporation1
- Microtrace Analytical Services1
- Mikart, Inc.1
- Miles Laboratories, Inc1
- Milliken Chemical Company1
- Ministry of Town and Country Planning Library1
- Missouri Botanical Garden1