deal in vs keep in stock

deal in

verb
  • To trade (buy and sell) a named commodity. 

  • To accept (something or a piece of information) as a basis for a decision. 

  • To deal cards to someone entering a game; to enter someone into a game by dealing cards to that person. 

  • To have an interest in something. 

keep in stock

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