aide-mémoire vs non-paper

aide-mémoire

noun
  • A document circulated in a meeting or summit for discussion purposes. 

  • A memory aid; a reminder or memorandum, especially a book or document serving this purpose. 

non-paper

noun
  • A discussion paper which is not to form part of formal business, especially in the UN. 

adj
  • Used of information that is stored electronically 

  • Not made of paper 

How often have the words aide-mémoire and non-paper occurred in a corpus of books? (source: Google Ngram Viewer )