#book.artifact__volume  (books as a physical objects) a number of pages bound together; "he used a large book as a doorstop"
  supertype:  #product  #artifact (pm)
  subtype:  #album  #coffee-table_book  #folio  #hardback  #journal.book  #novel.book  #order_book  #paperback_book  #picture_book  #sketchbook  #notebook  pm#conference_proceedings (pm)
  part:  #book_binding__binding__cover__back  the front and back covering of a book; "the book had a leather binding"

2 statements are about indirect instances of #book.artifact: km#graph3_on_article, pm#graph1_on_conference
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