Gentry County vs Shackelford County

Gentry County

name

  • One of 114 counties in Missouri, United States. County seat: Albany. 

Shackelford County

name

  • One of 254 counties in Texas, United States. County seat: Albany. 

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