Gas and germ warfare: international legal history and present status.
D001694:Biological Warfare / Q000266:history*; D002618:Chemical Warfare / Q000266:history*; D006076:Government; D006540:Herbicides; D049673:History, 20th Century; D007391:International Cooperation; D007878:Legislation as Topic; D012106:Research; D013665:Tear Gases / Q000266:history; D014481:United States
D006540:Herbicides; D013665:Tear Gases