About: http://webisa.webdatacommons.org/190554543

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	Some of the texts on the back refer to dates such as 1917, 1919 etc, so at least part of the set dates from at least the 1920s.
http://www.w3.org/ns/prov#wasQuotedFrom	ngw.nl