imprint vs photoengraving

imprint

noun
  • An impression; the mark left behind by printing something. 

  • A distinctive marking, symbol or logo. 

  • The name and details of a publisher or printer, as printed in a book etc.; a publishing house. 

verb
  • To leave a print, impression, image, etc. 

  • To mark a gene as being from a particular parent so that only one of the two copies of the gene is expressed. 

  • To learn something indelibly at a particular stage of life, such as who one's parents are. 

photoengraving

noun
  • A process of transferring a photographic image onto a plate which is then etched and printed. 

  • A plate or reproduction made using this process. 

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