forgery vs microfiche

forgery

noun
  • The act of forging metal into shape. 

  • That which is forged, fabricated, falsely devised or counterfeited. 

  • The act of forging, fabricating, or producing falsely; especially the crime of fraudulently making or altering a writing or signature purporting to be made by another, the false making or material alteration of or addition to a written instrument for the purpose of deceit and fraud. 

microfiche

noun
  • A device used to magnify and read these sheets. 

  • A sheet of microfilm, six by four inches, holding several hundred reduced images of document pages, read using a microfiche reader or microfilm reader. 

verb
  • To convert (documents) to microfiche format. 

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