About: http://webisa.webdatacommons.org/9305565

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	In 1800, for example, the Census tracked free white males, free white females, all other free persons except Indians not taxed and slaves. (http://www2.census.gov/prod2/decennial/documents/1800-return-whole-number-of-persons.pdf)
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com