PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Add to this the fact that, although there is a letter to Russell in The John W. Campbell Letters Volume 1 (edited and compiled by Perry A. Chapdelaine, Sr., Tony Chapdelaine, and George Hay, AC Projects 1985), it dates from 1952; there is no mention of the story or its having been a factor in the creation and publication of Unknown, just a long argument with Russell about Charles Fort.
http://www.w3.org/ns/prov#wasQuotedFrom
  • philsp.com