About: http://webisa.webdatacommons.org/286019996

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	Beneath the writing surface is a slide, and compartmentalized slide, where people could keep their papers, quill pens, perhaps ink wells and things.
http://www.w3.org/ns/prov#wasQuotedFrom	pbs.org