letterhead vs papering

letterhead

noun
  • Paper marked with a letterhead. 

  • A portion of text at the top of a letter, identifying the sender and often giving their address etc., used for formal correspondence. 

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. 

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