About: http://webisa.webdatacommons.org/75309677

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 classic book on the subject is Eric Williams Capitalism and Slavery but there are a number of more recent studies as well (http://brown.edu/web/slaveryconf/research.html)
http://www.w3.org/ns/prov#wasQuotedFrom	gilderlehrman.org