About: http://webisa.webdatacommons.org/391501486

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	sources, including print versos, envelopes and sleeves originally accompanying the material, and other publications.
http://www.w3.org/ns/prov#wasQuotedFrom	cdlib.org