notepad vs record book

notepad

noun
  • A pad of paper, often bound, in which one jots down notes; a notebook. 

record book

noun
  • a book in which a record is kept of events, perhaps similar to a logbook. 

  • a book which lists achievements which break records, the most famous being "Guinness World Records", formerly known as "Guinness Book of Records". 

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