<http://caligraph.org/ontology/20th-century_natural_disaster>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:20th-century_natural_disasters> .
<http://caligraph.org/ontology/20th-century_natural_disaster>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/20th-century_disaster> .
<http://caligraph.org/ontology/20th-century_flood>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/20th-century_natural_disaster> .
<http://caligraph.org/ontology/20th-century_natural_disaster>	<http://www.w3.org/2000/01/rdf-schema#label>	"20th-century natural disaster" .
<http://caligraph.org/ontology/20th-century_natural_disaster>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Earthquake> .
<http://caligraph.org/ontology/20th-century_earthquake>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/20th-century_natural_disaster> .
<http://caligraph.org/ontology/20th-century_natural_disaster>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .