dumping ground vs wreck yard

dumping ground

noun
  • A landfill. 

  • Any place where unwanted items are sent. 

  • A presumably polyphyletic supraspecific taxon where species of unclear affinities are placed. 

wreck yard

noun
  • The location of a dismantling business where wrecked or decommissioned vehicles are brought. Their usable parts are sold for use in operating vehicles, while the unusable metal parts, known as scrap metal, are sold to recycling companies. 

How often have the words dumping ground and wreck yard occurred in a corpus of books? (source: Google Ngram Viewer )