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Biological warfare - Wikipedia
Biological weapons and bioterrorism: Past, present, and future
Germ warfare: Weaponizing an illness is older than you might think - CBC.ca
History of biological warfare - Wikipedia
Biological Warfare: Infectious Disease and Bioterrorism
Biological weapon | Types, Effects & History | Britannica
Biological weapon - Warfare, History, Pathogens | Britannica
Biowarfare, bioterrorism and biocrime: A historical overview on ...
Biological weapons - World Health Organization (WHO)
biological warfare summary | Britannica