#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  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: graph3_on_article, graph1_on_conference
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