<http://ns.inria.fr/covid19/PMC5801815#body_text>	<http://purl.org/dc/terms/subject>	"Independent cities in the United States" .
<http://ns.inria.fr/covid19/PMC5801815#body_text>	<http://purl.org/dc/terms/subject>	"Medical mnemonics" .
<http://ns.inria.fr/covid19/PMC5801815#body_text>	<http://purl.org/dc/terms/subject>	"1993 establishments in Pennsylvania" .