About: http://webisa.webdatacommons.org/131338882

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	And in the book, one of the things you mention that historically cities tend to collapse when people do not have a certain amount of economic mobility, and they have to go elsewhere.
http://www.w3.org/ns/prov#wasQuotedFrom	kalw.org