The M114 was a sub-munition for the M33 cluster bomb, as such, it was the first standardized U.S. biological weapon in 1952. The M114 was an improved version of a British World War II-era bomblet that was designed to disperse anthrax.
The M114 was similar to a pipe bomb, it had a 21-inch tube with a diameter of 1⅝ inches. 108 M114s were clustered into the M33 cluster bomb; each had its own detonator and was ejected from the M33 while the bomb was still aloft. Each M114 held 320 milliliters of Brucella suis.
- Smart, Jeffery K. Medical Aspects of Chemical and Biological Warfare Archived 2012-08-26 at the Wayback Machine: Chapter 2 - History of Chemical and Biological Warfare: An American Perspective, (PDF: p. 51), Borden Institute, Textbooks of Military Medicine, PDF via Maxwell-Gunter Air Force Base, accessed November 13, 2008.
- Croddy, Eric and Wirtz, James J. Weapons of Mass Destruction: An Encyclopedia of Worldwide Policy, Technology, and History, (Google Books), ABC-CLIO, 2005, p. 75, (ISBN 1851094903), accessed November 13, 2008.
- Kirby, Reid. "The CB Battlefield Legacy: Understanding the Potential Problem of Clustered CB Weapons Archived 2012-10-19 at the Wayback Machine", Army Chemical Review, pp. 25-29, July–December 2006, accessed November 12, 2008.
- Regis, Edward. The Biology of Doom: The History of America's Secret Germ Warfare Project, (Google Books), Macmillan, 2000, p. 140, (ISBN 080505765X).