M.A. vs MA

M.A.

noun

  • Master of Arts (degree). 

MA

name

  • Postal abbreviation of Massachusetts, a state of the United States of America. 

  • Maluku, a province of Indonesia. 

  • Maranhão, a state of Brazil. 

How often have the words M.A. and MA occurred in a corpus of books? (source: Google Ngram Viewer )