About: http://webisa.webdatacommons.org/33215835

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	Each slide consisted of two pieces of glass; one carried the image, and the other was a plain piece protecting the illustrated surface.
http://www.w3.org/ns/prov#wasQuotedFrom	questia.com