handkerchief vs pocket handkerchief

handkerchief

noun
  • A piece of cloth shaped like a handkerchief to be worn about the neck; a neckerchief or neckcloth. 

  • A piece of cloth, usually square and often fine and elegant, carried for wiping the face, eyes, nose or hands. 

pocket handkerchief

noun
  • handkerchief 

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