papering vs wallcovering

papering

noun
  • Wallpaper. 

  • A technique of boycotting a judge by the Public Defender's Office by filing a request for a different judge in every case assigned to this judge. 

wallcovering

noun
  • A covering for a wall, such as wallpaper 

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