Assertion: potassium nitrate | /r/HasProperty | referenced
Facets:
value: several times
type: TEMPORAL
Source sentences:
text: Potassium nitrate – or "nitre" – is referenced several times as lining the vaults in the Edgar Allan Poe short story
text: Potassium nitrate – or "nitre" – is referenced several times as lining the vaults in the Edgar Allan Poe short story