_:vb39748	<http://www.w3.org/ns/r2rml#objectMap>	_:vb39750 .
_:vb39750	<http://www.w3.org/ns/r2rml#column>	"erf_datum" .
_:vb39748	<http://www.w3.org/ns/r2rml#predicateMap>	_:vb39749 .
_:vb39749	<http://www.w3.org/ns/r2rml#constant>	<http://purl.org/dc/terms/created> .