Presidential Directive 28: United States Policy on Chemical Warfare Program and Bacteriological/Biological Research Program [open pdf - 56KB]
Alternate Title: PD/NSC 28: United States Policy on Chemical Warfare Program and Bacteriological/Biological Research Program
In this Directive, President Carter directs that "the term Chemical and Biological Warfare (CBW) will no longer be used. The reference should be to the two categories separately " The Chemical Warfare Program and the Biological research Program."
PD/NSC 28; Presidential Directive 28
Jimmy Carter Library and Museum: http://www.jimmycarterlibrary.org/