meerschaum vs tobacco pipe

meerschaum

noun
  • A smoking-pipe made from meerschaum. 

  • A soft white mineral, chiefly used for smoking-pipes and cigar holders. 

tobacco pipe

noun
  • A small, hand-held device consisting in its simplest form of a bowl and stem; used for inhaling the smoke of burning tobacco. 

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