About: http://webisa.webdatacommons.org/34557394

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	The SPD universe consists of people who resided in the United States (except those living in institutions, such as prisons and nursing homes or entire military households) in March 1992 or March 1993.
http://www.w3.org/ns/prov#wasQuotedFrom	census.gov