<http://ns.inria.fr/covid19/PMC7149466#body_text>	<http://purl.org/dc/terms/subject>	"Explorers of Alaska" .
<http://ns.inria.fr/covid19/PMC7149466#body_text>	<http://purl.org/dc/terms/subject>	"History of the Pacific Northwest" .
<http://ns.inria.fr/covid19/PMC7149466#body_text>	<http://purl.org/dc/terms/subject>	"Treaties of the Republic of the Congo" .