Lincrusta vs wallcovering

Lincrusta

noun
  • A wallcovering made from a paste of gelled linseed oil and woodflour spread on heavy canvas and embossed with a pattern. 

wallcovering

noun
  • A covering for a wall, such as wallpaper 

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