About: http://webisa.webdatacommons.org/421327579

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	Unfortunately, it is not easy to compare these studies with one another, for in almost every country different systems of classifying occupations were employed.
http://www.w3.org/ns/prov#wasQuotedFrom	commentarymagazine.com