About: http://webisa.webdatacommons.org/360131330

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	In fact, the one piece of paper in the file was a letter I had written myself, ten years ago, requesting information on Abraham Mark and his wife, Mary Isabella Heffelfinger.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com