lithograph vs monoprint

lithograph

noun
  • A printed image produced by lithography. 

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

monoprint

noun
  • A form of printing on paper from a glass sheet to which oil paint has been applied; monotype. 

verb
  • To print using this technique. 

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