gravure vs lithograph

gravure

noun
  • A type of intaglio printing process, in which an image is engraved onto a rotating copper cylinder. 

  • A style of Japanese softcore; glamour photography. 

lithograph

noun
  • A printed image produced by lithography. 

verb
  • To create a copy of an image through lithography. 

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