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<http://caligraph.org/ontology/Ironworks_and_steel_mill_in_Pennsylvania>	<http://www.w3.org/2000/01/rdf-schema#label>	"Ironworks and steel mill in Pennsylvania" .
<http://caligraph.org/ontology/Ironworks_and_steel_mill_in_Pennsylvania>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Ironworks_and_steel_mill_in_the_United_States> .
<http://caligraph.org/ontology/Ironworks_and_steel_mill_in_Pennsylvania>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Industrial_building_or_structure_in_Pennsylvania> .
<http://caligraph.org/ontology/Ironworks_and_steel_mill_in_Pennsylvania>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Ironworks_and_steel_mills_in_Pennsylvania> .