About: http://webisa.webdatacommons.org/452859211

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Whether Johnson was a slave or not is open to question since his name appears in the City Directory of Baltimore from 1796 to 1824, when the directory did not list slaves.
http://www.w3.org/ns/prov#wasQuotedFrom	si.edu