West Riding of Yorkshire vs West Yorkshire

West Riding of Yorkshire

name
  • A historical division of Yorkshire. 

  • A local government district and ceremonial county in the north east of England. 

West Yorkshire

name
  • A metropolitan county in northern England bordering Derbyshire, South Yorkshire, North Yorkshire, Lancashire and Greater Manchester. 

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