About: http://webisa.webdatacommons.org/202348388

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	His problem was that, before the development of photoelectric or other physical means of measuring light, everything had to be done by eye and mind???like art history.
http://www.w3.org/ns/prov#wasQuotedFrom	typepad.com