autography vs penning

autography

noun
  • Writing in one's own handwriting. 

  • A process in lithography by which a writing or drawing is transferred from paper to stone. 

  • An autobiography. 

penning

noun
  • Writing; literary composition. 

  • An old currency unit, the Swedish penning. 

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