Asphyxiating and poisonous

An atlas of gas poisoning Great Britain 1938 Chemical warfare Spiers, edwam M. 1928 Chemicals in war Prentiss, Augustin Mitchell 1937 Powder, explosives, special rockets and jet propellants, war gases and smoke acid United States Strategic Bombing Survey 1947 Recommended health-based occupational exposure limits for respiratory irritants Author not listed 1983