issuer vs publication

issuer

noun
  • One who issues, emits, or publishes. 

publication

noun
  • An issue of printed or other matter, offered for sale or distribution. 

  • The act of publishing printed or other matter. 

  • The communication of information to the general public etc. 

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