Coronation vs Keystone

Coronation

name

  • A town in Alberta, Canada. 

Keystone

name

  • A city and town in Iowa. 

  • A town in South Dakota. 

  • A census-designated place in Colorado. 

  • A ghost town in North Dakota. 

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