Burden vs Gas

Burden

name
  • A minor city in Cowley County, Kansas, United States. 

  • A surname. 

  • A village in Erpeldange commune, Luxembourg (French spelling). 

Gas

name
  • A city in Kansas. 

  • A commune in Eure-et-Loir, France. 

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