<http://caligraph.org/ontology/1910s_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/18th-century_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/19th-century_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/1st-millennium_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/3rd-millennium_BC_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/Public_domain_book>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/17th-century_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/Public_domain_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Book> .
<http://caligraph.org/ontology/Public_domain_book>	<http://www.w3.org/2000/01/rdf-schema#label>	"Public domain book" .
<http://caligraph.org/ontology/16th-century_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/1st-millennium_BC_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .
<http://caligraph.org/ontology/Public_domain_book>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Public_domain_books> .
<http://caligraph.org/ontology/Medieval_book>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Public_domain_book> .