Assertion: mustard gas | /r/ObjectUse | used in ussurvivor
Facets:
value: extensively
type: DEGREE
Source sentences:
text: Another class of chemical weapons includes mustard gas, which was used extensively in World War I. UK and USsurvivors who were exposed to this agent have been shown to have evidence not only of chronic respiratory disease, but also of cancer of the pharynx, larynx, and lung