leaflet vs printed matter

leaflet

noun
  • A small sheet of paper containing information, used for dissemination of said information, often an advertisement. 

  • One of the components of a compound leaf. 

  • A flap of a valve of a heart or blood vessel. 

  • A small plant leaf. 

verb
  • To distribute leaflets to. 

  • To distribute leaflets. 

printed matter

noun
  • Printed material produced by printers and publishers, including books, magazines, brochures, booklets, publicity material and newspapers, especially in relation to cheaper postage rates on such material. 

How often have the words leaflet and printed matter occurred in a corpus of books? (source: Google Ngram Viewer )