bookfell vs wallcovering

bookfell

noun
  • A skin prepared for writing upon; a sheet of vellum or parchment; paper. 

  • A vellum or parchment manuscript. 

wallcovering

noun
  • A covering for a wall, such as wallpaper 

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