<http://caligraph.org/ontology/Book_about_energy_issues>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Books_about_energy_issues> .
<http://caligraph.org/ontology/Book_about_energy_issues>	<http://www.w3.org/2000/01/rdf-schema#label>	"Book about energy issues" .
<http://caligraph.org/ontology/Book_about_energy_issues>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Work_about_energy> .
<http://caligraph.org/ontology/Book_about_coal>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Book_about_energy_issues> .
<http://caligraph.org/ontology/Book_about_energy_issues>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Environmental_non-fiction_book> .
<http://caligraph.org/ontology/Book_by_Amory_Lovins>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Book_about_energy_issues> .
<http://caligraph.org/ontology/Book_about_nuclear_issues>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Book_about_energy_issues> .
<http://caligraph.org/ontology/Book_about_energy_issues>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Book_about_petroleum>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Book_about_energy_issues> .