About: http://webisa.webdatacommons.org/121669928

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	Preferably, this medium comprises a plurality of hygroscopic discs 28 made of any suitable material which will expand or swell when exposed to water, e.g. paper, cardboard, wood and the like.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com