memoir vs monography

memoir

noun
  • An autobiography; a book describing the personal experiences of an author. 

  • A biography; a book describing the experiences of a subject from personal knowledge of the subject or from sources with personal knowledge of the subject. 

  • Any form of narrative describing the personal experiences of a writer. 

monography

noun
  • A monograph. 

  • Representation by lines without colour; an outline drawing. 

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