memo vs monography

memo

noun
  • A short note; a memorandum. 

  • A record of partial results that can be reused later without recomputation. 

verb
  • To record something; to make a note of something. 

  • To send someone a note about something, for the record. 

monography

noun
  • A monograph. 

  • Representation by lines without colour; an outline drawing. 

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