mezzotint vs woodcut

mezzotint

noun
  • An etching or print made using this method. 

  • A form of intaglio etching in which a metal plate is roughened evenly and then smoothed to bring out an image. 

verb
  • To make such etchings 

woodcut

noun
  • A print produced with this method. 

  • A method of printmaking from such a block. 

  • An engraved block of wood, especially one used as a printing form. 

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