blue book vs white pages

blue book

noun
  • A book of statistics or almanac, usually published by an agency or as a trade publication. 

  • Used other than figuratively or idiomatically: see blue, book. 

white pages

noun
  • The telephone directory (or section of a larger directory) that lists residential numbers. 

How often have the words blue book and white pages occurred in a corpus of books? (source: Google Ngram Viewer )