About: http://webisa.webdatacommons.org/211472094

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 1960 and subsequent samples employed more elaborate stratification schemes based not only on geography but also on such characteristics as household size, race, and group quarters membership.
http://www.w3.org/ns/prov#wasQuotedFrom	ipums.org