<http://caligraph.org/ontology/Aviation_accident_or_incident_in_1981>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/20th-century_aviation_accident_or_incident> .
<http://caligraph.org/ontology/Aviation_accident_or_incident_in_1981>	<http://www.w3.org/2000/01/rdf-schema#label>	"Aviation accident or incident in 1981" .
<http://caligraph.org/ontology/Aviation_accident_or_incident_in_1981>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Aviation_accidents_and_incidents_in_1981> .
<http://caligraph.org/ontology/Aviation_accident_or_incident_in_the_United_States_in_1981>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Aviation_accident_or_incident_in_1981> .
<http://caligraph.org/ontology/Aviation_accident_or_incident_in_1981>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .