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<http://caligraph.org/ontology/Grinding_mill_in_North_Dakota>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Agricultural_building_or_structure_in_North_Dakota> .
<http://caligraph.org/ontology/Agricultural_building_or_structure_on_the_National_Register_of_Historic_Places_in_North_Dakota>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Agricultural_building_or_structure_in_North_Dakota> .
<http://caligraph.org/ontology/Barn_in_North_Dakota>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Agricultural_building_or_structure_in_North_Dakota> .
<http://caligraph.org/ontology/Agricultural_building_or_structure_in_North_Dakota>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Agricultural_building_or_structure_in_the_United_States> .