1. W. Horwitz and J. W. Howard, Ninth Materials Research Symposium, Trace Organic Analysis. National Bureau of Standards. Gaithersburg, MD, USA, April 10–13, 1978. Proceedings to be published.
2. J. S. Winbush, In preparation.
3. J. Burke, Paper to be presented at the fourth International Congress of Pesticide Chemistry (IUPAC). Zurich, Switzerland, July 24–28, 1978.
4. Quality Assurance Practices for Health Laboratories;Horwitz,1978