certificate(s) vs logbook

certificate(s)

logbook

noun
  • A book in which measurements from the ship's log are recorded, along with other salient details of the voyage. 

  • A record of the ownership, and licensing of a motor car 

  • A book in which events are recorded; a journal, especially of travel. 

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