Clouds of Secrecy: The Army's Germ Warfare Tests Over Populated Areas by Leonard Cole

In the 1970s Americans learned for the first time that they had been used for decades as unsuspecting guinea pigs in a series of astonishing experiments conducted by the US Army. Military researchers had been secretly spraying clouds of bacteria over populated areas in order to study America's vulnerability to biological weapons. Many civilians have suffered illness, even death, as a consequence.