This volume presents information on a wide range of chemical and biological agents. Chemical agents detailed in this volume are those that were developed specifically for their non-lethal potential. The biological agents described are militarily significant pathogens that could be weaponized to pose a threat to people, animals, or crops and other agricultural interests. Mid-spectrum agents, materials that do not fit clearly into either the Chemical or the Biological Weapons Conventions, include toxins and bioregulators. Entomological agents, the final class of agents discussed in volume, are arthropods that could pose a significant threat to a country’s agriculture infrastructure and be used to devastate its economy. They were proposed for inclusion in the Biological Weapons Convention but never adopted.