<http://caligraph.org/ontology/Non-fiction_book_about_military_history_of_the_United_States>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_American_Civil_Engineering>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_the_United_States>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/History_book_about_the_United_States>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_North_America> .
<http://caligraph.org/ontology/History_book_about_the_Spanish_East_Indies>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_the_United_States>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_countries> .
<http://caligraph.org/ontology/Book_about_Native_American_history>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_the_United_States>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:History_books_about_the_United_States> .
<http://caligraph.org/ontology/Non-fiction_book_about_the_Great_Depression>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/Non-fiction_book_about_the_Great_Recession>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_Texas>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_New_France>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .
<http://caligraph.org/ontology/History_book_about_the_United_States>	<http://www.w3.org/2000/01/rdf-schema#label>	"History book about the United States" .
<http://caligraph.org/ontology/History_book_about_the_American_Old_West>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/History_book_about_the_United_States> .