back forty vs one-horse town

back forty

noun
  • The most remote or inaccessible part of any place. 

  • The remote part of a farm. 

one-horse town

noun
  • A very small town, especially one of a rural nature and/or offering very few or no attractions. 

How often have the words back forty and one-horse town occurred in a corpus of books? (source: Google Ngram Viewer )