calumet vs tobacco pipe

calumet

noun
  • A clay tobacco-pipe used by American Indians, especially as a symbol of truce or peace. 

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 calumet and tobacco pipe occurred in a corpus of books? (source: Google Ngram Viewer )