back forty vs holding

back forty

noun
  • The remote part of a farm. 

  • The most remote or inaccessible part of any place. 

holding

noun
  • A tenure; a farm or other estate held of another. 

  • Something that one owns, especially stocks and bonds. 

  • A determination of law made by a court. 

  • A holding company, or other kind of company (by back-translation from Russian холдинг (xolding)). 

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