_:vb39979	<http://www.w3.org/ns/r2rml#column>	"ISSNs" .
_:vb39978	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/ontology/bibo/issn> .
_:vb39977	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb39978 .
_:vb39977	<http://www.w3.org/ns/r2rml#objectMap>	_:vb39979 .